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Search results “Digital signature algorithm in cryptography books”
DSA - Algorithms Introduction
 
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This lecture talks about the basics of an algorithm
Ask Developer Podcast - 49 - Cryptography - Part 3 - Digital Signatures and Protocols
 
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○ Digital Signatures § Goal: verify Authenticity of a message. § Based on Asymmetric Cryptography. § Basic operations 1. Public / Private keys generation (using some algorithm like RSA) 2. Signing algorithm using the private key 3. Signature verification algorithm using the corresponding public key i. Extending previous Example • Steps (Order is very important, bold stuff is the difference added to authenticate sender) ® Party 1 (Alice) 1. Generates a random AES Session Key (32 bytes / 256 bits) 2. Generates a random Initialization Vector (IV) (16 bytes / 128 bits) 3. Encrypt the message to be sent using the AES Session Key & IV 4. Calculate an HMAC of the encrypted message using the AES Session key 5. Encrypt the AES Session Key using the Public Key of Party 2 (Bob) The recipient. 6. Calculate Signature using the private signing key on the HMAC 7. Sends a packet of (Encrypted Message, Encrypted Session Key, Initialization Vector, HMAC, and Signature) to Bob ® Party 2 (Bob) 1. Decrypts Session key using his Private Key 2. Recalculates the HMAC of the encrypted message (Validates message integrity) } If HMAC check pass – Verify digital signature using Alice Public Key w If signature verification pass w Decrypts the message using the decrypted AES Session Key and Initialization Vector w Otherwise, identity of the sender couldn't not be verified, reject message. } Otherwise, rejects the message because of integrity check failure. • Why Order matters? ® Timing Side-Channel Attacks ® Padding-Oracle Attack ○ Protocols § TLS/SSL • How TLS/SSL Works? • Mitigates against ® Man in the Middle Attacks ® Authentication, so the client can be sure it is talking to the correct destination. § Public Key Infrastructure (PKI) • Certificates aka X.509 Certificate (Sha-1 Signature Issues) ® A digitally signed file ® Identifies (Computer / User / Device) ® Has Public & Private Key, only the certificate owner has the Private Key. ® Has Expiration date ® Information about the CA that issued the cert ® X.509 Extension Attributes (like Usage attribute) ® Revocation Information. • Certificate Authority (CA) (CNNIC, WoSign) ® Issues, signs and manages certificates. ® Famous certificate authorities (Verisign, GoDaddy, … etc). • Trust Chains ® CA's can delegate the signing job to subordinate CA's ◊ Root CA's signs an intermediate signing certificate to the subordinate CA ® The subordinate CA can then issue certificates ® To validate a certificate, the client validates the signatures of all the intermediate stages and make sure all of them are linked to a Trusted CA • Certificate Revocation Lists (CRL's) ® When a certificate is compromised (Private Key leaked) it will be published on the CRL, so each time the cert is validated, the CRL list is checked in case cert is revoked. 3. Takeaways 4. Books a. Understanding Cryptography: A Textbook for Students and Practitionershttps://www.amazon.com/Understanding-Cryptography-Textbook-Students-Practitioners/dp/3642041000 Our facebook Page http://facebook.com/askdeveloper On Sound Cloud http://soundcloud.com/askdeveloper Please Like & Subscribe
Views: 740 Mohamed Elsherif
What Is Digital Signature In Cryptography?
 
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In the united states and certain other countries. Digital signature initiative links on law, cryptography and electronic communications 10 dec 2012 these types of cryptographic primitive can be distinguished by the security goals they fulfill (in simple protocol 'appending to a message') entrust is registered trademark entrust, inc. Bitcoin digital signatures (video) microsoft docs. Origin of cryptography, modern cryptosystems, attacks on 19 nov 2014 digital signatures are based public key also known as asymmetric cryptography. Cryptography digital signatures wikibooks, open books for an introduction to signature how do they work? Cgi. How do digital signatures work? Youtube. What is digital signature? Definition from whatis what a are the differences between signature, mac and an introduction to cryptography signatures v2. Entrust is a registered trademark of entrust limited in canada elements applied cryptographydigital signatures with appendix. Digital signatures based cryptographic goals; Message authentication codes (macs)rsa digital signaturecomparison of ecdsa as 2014, installing apps is probably the most common way people use. Digital signatures are one of the most important inventions modern cryptography. Using a public key algorithm such as rsa, digital signature is mathematical scheme for demonstrating the authenticity of signatures are standard element most cryptographic protocol suites, and commonly used software distribution, financial transactions, make sure documents you send electronically authentic. This coupling is established using public key cryptography and 3 oct 2016 over the years, digital signatures have become more secure by adding information to key, different types of cryptography, chapter 9. The problem is how can a user sign What digital signature? Definition from whatis what are the differences between signature, mac and an introduction to cryptography signatures v2. Keys are used to encrypt information. Encrypting information 1 oct 2005 digital signatures are coupled to the electronic document which they apply. Both android and ios require an app to be digitally signed before it 20symmetric key cryptography is a mechanism by which the same used for both this characteristic implement encryption digital signature 130 mar 2017 cryptographic signatures use public algorithms provide data integrity. What is a digital signature? . Chapter 09 digital signatures fi muni. Digital signatures with message recovery. Understanding digital certificates technet microsoft. Learn about digital signatures and other authentication methods. Cryptography digital signatures learn cryptography in simple and easy steps. Crash c
Views: 19 Hadassah Hartman
💥 JWT HS256 Signature - Learn What is a Hash-Based Message Authentication Code (HMAC)
 
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This video is part of the Angular Security MasterClass - Web Security Fundamentals Course - https://angular-university.io/course/angular-security-course In this lesson, we are going to learn the concept of a Message Authenticaton Code or MAC. We will cover the HS256 JWT signature which is a Hash Based Message Authentication Code, or HMAC. For more videos tutorials on Angular, check the Angular University website - https://angular-university.io Follow us: Twitter - https://twitter.com/AngularUniv Google+ - https://plus.google.com/u/1/113731658724752465218 Facebook - https://www.facebook.com/angular.university Check out the PDF E-Books available at the Angular University - https://angular-university.io/my-ebooks
Views: 4366 Angular University
Hashing Algorithms and Security - Computerphile
 
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Audible free book: http://www.audible.com/computerphile Hashing Algorithms are used to ensure file authenticity, but how secure are they and why do they keep changing? Tom Scott hashes it out. More from Tom Scott: http://www.youtube.com/user/enyay and https://twitter.com/tomscott http://www.facebook.com/computerphile https://twitter.com/computer_phile This video was filmed and edited by Sean Riley. Pigeon Sound Effects courtesy of http://www.freesfx.co.uk/ Computerphile is a sister project to Brady Haran's Numberphile. See the full list of Brady's video projects at: http://bit.ly/bradychannels
Views: 704827 Computerphile
Hashing and Digital Signatures - CompTIA Security+ SY0-501 - 6.1
 
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Security+ Training Course Index: http://professormesser.link/sy0501 Professor Messer’s Course Notes: http://professormesser.link/501cn Frequently Asked Questions: http://professormesser.link/faq - - - - - A cryptographic hash can be used for many different tasks. In this video, you’ll learn about hashing, collisions, digital signatures, and more. - - - - - Subscribe to get the latest videos: http://professormesser.link/yt Calendar of live events: http://www.professormesser.com/calendar/ FOLLOW PROFESSOR MESSER: Professor Messer official website: http://www.professormesser.com/ Twitter: http://www.professormesser.com/twitter Facebook: http://www.professormesser.com/facebook Instagram: http://www.professormesser.com/instagram Google +: http://www.professormesser.com/googleplus
Views: 12589 Professor Messer
Cryptography
 
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This book is a clear and informative introduction to cryptography and data protection - subjects of considerable social and political importance. It explains what algorithms do, how they are used, the risks associated with using them, and why governments should be concerned. Important areas are highlighted, such as Stream Ciphers, block ciphers, public key algorithms, digital signatures, and applications such as e-commerce. This book highlights the explosive impact of cryptography on modern society, with, for example, the evolution of the internet and the introduction of more sophisticated banking methods.
Views: 2 Dren Nemo Hoti
Philippe Gaborit - RankSign: An Efficient Signature Algorithm Based on the Rank  Metric
 
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Philippe Gaborit of the University of Limoges and the XLIM Research Institute presented a talk titled: RankSign: An efficient signature algorithm based on the rank metric at the 2014 PQCrypto conference in October, 2014. Abstract: In this paper we propose a new approach to code-based signatures that makes use in particular of rank metric codes. When the classical approach consists in finding the unique preimage of a syndrome through a decoding algorithm, we propose to introduce the notion of mixed decoding of erasures and errors for building signature schemes. In that case the difficult problem becomes, as in the case in lattice-based cryptography, finding a preimage of weight above the Gilbert-Varshamov bound (case where many solutions occur) rather than finding a unique preimage of weight below the Gilbert-Varshamov bound. The paper describes RankSign: a new signature algorithm for the rank metric based on a new mixed algorithm for decoding erasures and errors for the recently introduced Low Rank Parity Check (LRPC) codes. We explain how it is possible (depending on choices of parameters) to obtain a full decoding algorithm which is able to find a preimage of reasonable rank weight for any random syndrome with a very strong probability. We study the semantic security of our signature algorithm and show how it is possible that no information leaks through signatures. Finally we give several examples of parameters for our scheme, some of which with public key of size 11, 520 bits and signature of size 1728 bits. Moreover the scheme can be very fast for small base fields. PQCrypto 2014 Book: http://www.springer.com/computer/security+and+cryptology/book/978-3-319-11658-7 Workshop: https://pqcrypto2014.uwaterloo.ca/ Find out more about IQC! Website - https://uwaterloo.ca/institute-for-qu... Facebook - https://www.facebook.com/QuantumIQC Twitter - https://twitter.com/QuantumIQC
NETWORK SECURITY - BLOCK CIPHER MODES OF OPERATION
 
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1. Electronic Code Book Mode 2. Cipher Block Chaining Mode 3. Output Feedback Mode 4. Cipher Feedback Mode 5. Counter Mode
Chris Peikert - Lattice Cryptography for the Internet
 
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Chris Peikert of Georgia Institute of Technology presented a talk titled: Lattice cryptography for the internet at the 2014 PQCrypto conference in October, 2014. Abstract: In recent years, lattice-based cryptography has been recognized for its many attractive properties, such as strong provable security guarantees and apparent resistance to quantum attacks, flexibility for realizing powerful tools like fully homomorphic encryption, and high asymptotic efficiency. Indeed, several works have demonstrated that for basic tasks like encryption and authentication, lattice-based primitives can have performance competitive with (or even surpassing) those based on classical mechanisms like RSA or Diffie-Hellman. However, there still has been relatively little work on developing lattice cryptography for deployment in real-world cryptosystems and protocols. In this work, we take a step toward that goal, by giving efficient and practical lattice-based protocols for key transport, encryption, and authenticated key exchange that are suitable as "drop-in" components for proposed Internet standards and other open protocols. The security of all our proposals is provable based (sometimes in the random-oracle model) on the well-studied "leaning with errors over rings" problem, and hence on the conjectured worst-case hardness of problems on ideal lattices (against quantum algorithms). One of our main technical innovations (which may be of independent interest) is a simple, low-bandwidth reconciliation technique that allows two parties who "approximately agree" on a secret value to reach exact agreement, a setting common to essentially all lattice-bases encryption schemes. Our technique reduces the ciphertext length of prior (already compact) encryption schemes nearly twofold, at essentially no cost. PQCrypto 2014 Book: http://www.springer.com/computer/security+and+cryptology/book/978-3-319-11658-7 Workshop: https://pqcrypto2014.uwaterloo.ca/ Find out more about IQC! Website - https://uwaterloo.ca/institute-for-qu... Facebook - https://www.facebook.com/QuantumIQC Twitter - https://twitter.com/QuantumIQC
Block Cipher Modes of Operation (CSS441, L06, Y15)
 
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Modes of operation for block ciphers, introducing ECB, CBC and Counter mode. Course material via: http://sandilands.info/sgordon/teaching
Views: 19634 Steven Gordon
Aurélie Phesso - An Efficient Attack on a Code-based Signature Scheme
 
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Title: An Efficient Attack on a Code-based Signature Scheme Authors: Aurélie Phesso and Jean-Pierre Tillich 7th International Conference on Post-Quantum Cryptography PQCrypto 2016 https://pqcrypto2016.jp/program/ Proceedings http://www.springer.com/jp/book/9783319293592
Views: 240 PQCrypto 2016
Cryptography: Crash Course Computer Science #33
 
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Today we’re going to talk about how to keep information secret, and this isn’t a new goal. From as early as Julius Caesar’s Caesar cipher to Mary, Queen of Scots, encrypted messages to kill Queen Elizabeth in 1587, theres has long been a need to encrypt and decrypt private correspondence. This proved especially critical during World War II as Allan Turing and his team at Bletchley Park attempted to decrypt messages from Nazi Enigma machines, and this need has only grown as more and more information sensitive tasks are completed on our computers. So today, we’re going to walk you through some common encryption techniques such as the Advanced Encryption Standard (AES), Diffie-Hellman Key Exchange, and RSA which are employed to keep your information safe, private, and secure. Note: In October of 2017, researchers released a viable hack against WPA2, known as KRACK Attack, which uses AES to ensure secure communication between computers and network routers. The problem isn't with AES, which is provably secure, but with the communication protocol between router and computer. In order to set up secure communication, the computer and router have to agree through what's called a "handshake". If this handshake is interrupted in just the right way, an attacker can cause the handshake to fault to an insecure state and reveal critical information which makes the connection insecure. As is often the case with these situations, the problem is with an implementation, not the secure algorithm itself. Our friends over at Computerphile have a great video on the topic: https://www.youtube.com/watch?v=mYtvjijATa4 Produced in collaboration with PBS Digital Studios: http://youtube.com/pbsdigitalstudios Want to know more about Carrie Anne? https://about.me/carrieannephilbin The Latest from PBS Digital Studios: https://www.youtube.com/playlist?list=PL1mtdjDVOoOqJzeaJAV15Tq0tZ1vKj7ZV Want to find Crash Course elsewhere on the internet? Facebook - https://www.facebook.com/YouTubeCrash... Twitter - http://www.twitter.com/TheCrashCourse Tumblr - http://thecrashcourse.tumblr.com Support Crash Course on Patreon: http://patreon.com/crashcourse CC Kids: http://www.youtube.com/crashcoursekids
Views: 169224 CrashCourse
21. Cryptography: Hash Functions
 
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MIT 6.046J Design and Analysis of Algorithms, Spring 2015 View the complete course: http://ocw.mit.edu/6-046JS15 Instructor: Srinivas Devadas In this lecture, Professor Devadas covers the basics of cryptography, including desirable properties of cryptographic functions, and their applications to security. License: Creative Commons BY-NC-SA More information at http://ocw.mit.edu/terms More courses at http://ocw.mit.edu
Views: 63879 MIT OpenCourseWare
What is a Digital Signature?
 
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This channel introduces the "e-Estonia" - a term commonly used to describe Estonia's emergence as one of the most advanced e-societies in the world. You can learn more about Estonian ICT and technology by watching the videos, visiting our homepage http://e-estonia.com or follow us on FB e-Estonia .You can also book a visit and live demo at Estonian ICT Demo Center in Tallinn and establish business contacts with Estonian ICT companies.
Views: 204451 e-estonia
RSA Algorithm with solved example using extended euclidean algorithm | CSS series #7
 
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Take the Full Course of Cryptography and Network Security What we Provide 1) 20 Videos (Index is given down) + More Update will be Coming Before final exams 2)Hand made Notes with problems for your to practice 3)Strategy to Score Good Marks in Cryptography and Network Scurity To buy the course click https://goo.gl/mpbaK3 if you have any query email us at [email protected] Sample Notes : https://goo.gl/Ze1FpX or Fill the form we will contact you https://goo.gl/forms/2SO5NAhqFnjOiWvi2 Cryptography and System Security Index Lecture 1 Introduction to Cryptography and Security System Lecture 2 Security Goals and Mechanism Lecture 3 Symmetric Cipher Lecture 4 Substitution Cipher Lecture 5 Transposition Cipher Lecture 6 Stream and Block Cipher Lecture 7 Mono Alphabetic Cipher Lecture 8 Poly Alphabetic Cipher Lecture 9 Diffie Hellman Lecture 10 RSA Algorithm with Solved Example Lecture 11 IDEA Algorithm Full Working Lecture 12 SHA-1 Algorithm Full Working Lecture 13 Blowfish Algorithm Full working Lecture 14 DES Algorithm Full Working Lecture 15 Confusion and Diffusion Lecture 16 AES Algorithm Full working Lecture 17 Kerberos Lecture 18 Malicious Software ( Virus and worms ) Lecture 19 DOS and DDOS Attack Lecture 20 Digital Signature Full working Explained More videos Coming Soon.
Views: 196564 Last moment tuitions
Lecture 8: Advanced Encryption Standard (AES) by Christof Paar
 
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For slides, a problem set and more on learning cryptography, visit www.crypto-textbook.com. The AES book chapter for this video is also available at the web site (click Sample Chapter).
Lecture 1: Introduction to Cryptography by Christof Paar
 
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For slides, a problem set and more on learning cryptography, visit www.crypto-textbook.com. The book chapter "Introduction" for this video is also available for free at the website (click "Sample Chapter").
Practical Cryptography in Dot Net
 
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This is a sample clip from the course Practical Cryptography in .NET by Stephen Haunts released by Pluralsight. As a software developer you have a duty to your employer to secure and protect their data. In this course you will learn how to use the .NET Framework to protect your data to satisfy confidentiality, integrity, non-repudiation and authentication. This course covers random number generation, hashing, authenticated hashing and password based key derivation functions. The course also covers both symmetric and asymmetric encryption using DES, Triple DES, AES and RSA. You then learn how to combine these all together to product a hybrid encryption scheme which includes AES, RSA, HMACS and Digital Signatures. If you like this channel, you can support me by buying one of my books on Kindle or Paperback. A Gentle Introduction to Agile Software Development https://amzn.to/2qoWW4o A Gentle Introduction to Lean Software Development https://amzn.to/2JMosky A Gentle Introduction to Speaking in Public https://amzn.to/2JPwKZ8 A Gentle Introduction to Beating Procrastination and Getting Focused https://amzn.to/2vk63s3 A Gentle Introduction to Agile and Lean Software Development https://amzn.to/2qB0XC8
Views: 455 Stephen Haunts
(New Discussion Andreas  Antonopoulos) What Happens If The Digital signature algorithm compromised?
 
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What are the odds of "rogue developers" who introduce vulnerabilities? What happens if the digital signature algorithm is compromised? Is trust in hardware wallet developers and the firmware update process a problem? Note: I was mostly talking about Bitcoin and other popular open blockchains which have a large development communities and a robust review process before any new code is put in production. The risk of vulnerabilities introduced by developers is different for each project, and having open-source code does not prevent it if no one is reading or testing it. These questions were part of the monthly live Patreon Q&A session for April (rescheduled to May 5th). If you want early-access to talks and a chance to participate in the monthly live Q&As with Andreas, become a patron: https://www.patreon.com/aantonop RELATED: Software distribution security - https://youtu.be/_V0vqy046YM Geopolitics and state-sponsored attacks - https://youtu.be/htxPRTJLK-k How to get people to care about security - https://youtu.be/Ji1lS9NMz1E What is the roadmap? - https://youtu.be/5Eoj_sKyC90 Why developers are leaving banks - https://youtu.be/GqOZ4IAQ-xQ Honest nodes and consensus - https://youtu.be/KAhY2ymI-tg Why running a node is important - https://youtu.be/oX0Yrv-6jVs Lessons from the hard fork - https://youtu.be/hnAWAVNnGCw Cryptographic primitives - https://youtu.be/RIckQ6RBt5E Nonces, mining, and quantum computing - https://youtu.be/d4xXJh677J0 Public keys vs. addresses - https://youtu.be/8es3qQWkEiU Re-using addresses - https://youtu.be/4A3urPFkx8g Using paper wallets - https://youtu.be/cKehFazo8Pw Wallet design and mass adoption - https://youtu.be/WbZX6BDZJHc Secure, tiered storage system - https://youtu.be/uYIVuZgN95M The Courage to Innovate Without Permission - https://youtu.be/ywq6NBETUJ8 What is Consensus: Rules Without Rulers - https://youtu.be/2tqo7PX5Pyc Decentralized Truth - https://youtu.be/XCVaabu3J04 Andreas M. Antonopoulos is a technologist and serial entrepreneur who has become one of the most well-known and respected figures in bitcoin. Follow on Twitter: @aantonop https://twitter.com/aantonop Website: https://antonopoulos.com/ He is the author of two books: “Mastering Bitcoin,” published by O’Reilly Media and considered the best technical guide to bitcoin; “The Internet of Money,” a book about why bitcoin matters. THE INTERNET OF MONEY, v1: https://www.amazon.co.uk/Internet-Money-collection-Andreas-Antonopoulos/dp/1537000454/ref=asap_bc?ie=UTF8 [NEW] THE INTERNET OF MONEY, v2: https://www.amazon.com/Internet-Money-Andreas-M-Antonopoulos/dp/194791006X/ref=asap_bc?ie=UTF8 MASTERING BITCOIN: https://www.amazon.co.uk/Mastering-Bitcoin-Unlocking-Digital-Cryptocurrencies/dp/1449374042 [NEW] MASTERING BITCOIN, 2nd Edition: https://www.amazon.com/Mastering-Bitcoin-Programming-Open-Blockchain/dp/1491954388 Translations of MASTERING BITCOIN: https://bitcoinbook.info/translations-of-mastering-bitcoin/ Subscribe to the channel to learn more about Bitcoin & open blockchains! Music: "Unbounded" by Orfan (https://www.facebook.com/Orfan/) Outro Graphics: Phneep (http://www.phneep.com/) Outro Art: Rock Barcellos (http://www.rockincomics.com.br/)
The RSA Encryption Algorithm (Computing an Example)
 
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solution Ch #7 book Understanding Cryptography by Christof Paar · Jan Pelzl Let the two primes p = 41 and q = 17 be given as set-up parameters for RSA. 1. Which of the parameters e1 = 32,e2 = 49 is a valid RSA exponent? Justify your choice
Views: 80 Ahmed Dawood
What Is A Signature In Network Security?
 
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A digital signature (not to be confused with a digital certificate) is a mathematical technique used to validate the authenticity and integrity of a message, software or digital document. Cryptography and network security chapter 13william stallings, cryptography 3 e. Information & network security lecture digital signature (eng tutorial 3 youtube. What is digital signature standard (dss)? Definition from whatis wikipediadigital tutorialspoint. Signature? Definition from whatis. Googleusercontent search. All sensitive information is encrypted with the 3des protocol, hardware security module as network processors 13 may 2012 main requirement in management of digital documentation its equivalence, from a legal perspective, to paperwork, affixing signature on document fundamental principle which are based processes authorization and validation, apart specific area What signature? Definition whatis. Private key encryption private means that each computer has a secret (code) it can use to encrypt packet of information before is sent over the network other. The symantec connect community allows digital signature definition a guarantees the authenticity of an electronic document or message in communication and uses 19 nov 2016cryptography andfifth edition by william stallings. It was first proposed in 1991 selection from network security with openssl [book]. When an ids or ips sensor matches a digital signature algorithm (dsa) the dsa was developed by national institute for standards and testing (nist) security agency (nsa). Dss was put forth by the national institute of standards and technology (nist) in a digital signature is an authentication mechanism that enables creator message to attach code acts as. Do not require the original message as input to verification internet overview learn technologies in simple and easy steps starting from, reference models, domain name system, services, protocols, e mail overview, operations, email providers, websites development types, website cryptography networkfifth edition by william stallings. Techtarget definition digital signature url? Q webcache. The digital signature algorithm (dsa), developed by the national institute of standards and technology, is one many examples a signing gianluca dinidigital signatures with appendix. Changed by somesh jha)have looked at message authentication using hash functions. National security agency (nsa) to generate a digital signature for the authentication of electronic documents. Cryptography and network security (authentication protocols digital signatures)by william stallings. Network intrusion detection signatures, part one. Digital signatures with message recovery. Another widely used technology for creating digital signatures is the signature security standard (dss) that was developed by national 1. Only public key infrastructure (pki) digital signatures meet the requirements for such. Digital signature algorithm (dsa) network security with what is a digital signature?
Public key cryptography - Diffie-Hellman Key Exchange (full version)
 
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The history behind public key cryptography & the Diffie-Hellman key exchange algorithm. We also have a video on RSA here: https://www.youtube.com/watch?v=wXB-V_Keiu8
Views: 594390 Art of the Problem
Basic Management of Digital Signature
 
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This is a tutorial meant for people who have been issued digital signatures on behalf of Keltron. It describes the simple installation procedure of the WD-PROXkey Token tool and the basic management of the signature protected within it.
Cryptography Android App
 
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✴ Cryptography is about constructing and analyzing protocols that prevent third parties or the public from reading private messages; various aspects in information security such as data confidentiality, data integrity, authentication, and non-repudiation are central to modern cryptography. Modern cryptography exists at the intersection of the disciplines of mathematics, computer science, electrical engineering, communication science, and physics. Applications of cryptography include electronic commerce, chip-based payment cards, digital currencies, computer passwords, and military communications.✴ https://play.google.com/store/apps/details?id=in.softecks.cryptography ► This App is meant for students of computer science who aspire to learn the basics of cryptography. It will be useful for networking professionals as well who would like to incorporate various cryptographic algorithms to ensure secure data communication over their networks.✦ 【Topics Covered in this App are Listed Below】 ⇢ Origin of Cryptography ⇢ Modern Cryptography ⇢ Cryptosystems ⇢ Attacks On Cryptosystems ⇢ Traditional Ciphers ⇢ Modern Symmetric Key Encryption ⇢ Block Cipher ⇢ Feistel Block Cipher ⇢ Data Encryption Standard ⇢ Triple DES ⇢ Advanced Encryption Standard ⇢ Block Cipher Modes of Operation ⇢ Public Key Encryption ⇢ Data Integrity in Cryptography ⇢ Cryptography Hash functions ⇢ Message Authentication ⇢ Cryptography Digital signatures ⇢ Public Key Infrastructure ⇢ Cryptography Benefits & Drawbacks
Views: 110 10 Up's.!
Modes of Operations
 
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Subject:Computer Science Paper: Cryptography and network
Views: 3936 Vidya-mitra
Lecture 54   Introduction to Digital Signatures by NPTEL IIT MADRAS
 
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Like the video and Subscribe to channel for more updates. Recommended Books (8 Books , Please buy anything from the below links to support the channel): The Tangled Web – A Guide to Securing Modern Web Applications http://amzn.to/2yU13u7 The Web Application Hacker's Handbook: Finding and Exploiting Security Flaws, 2ed http://amzn.to/2kfm0Hj Computer Security: Art and Science http://amzn.to/2yaXRGZ Fundamentals of Database System http://amzn.to/2yaS984 Linux Command Line and Shell Scripting Bible, 3ed http://amzn.to/2CL9ecf Linux: The Complete Reference, Sixth Edition http://amzn.to/2CJrulW Shell Scripting: How to Automate Command Line Tasks Using Bash Scripting and Shell Programming http://amzn.to/2CGGHV0 Command Line Kung Fu: Bash Scripting Tricks, Linux Shell Programming Tips, and Bash One-liners http://amzn.to/2AI3Dlu Please Help the channel Grow by buying anything through the above links and by subscribing to the channel
Views: 106 KNOWLEDGE TREE
Enhanced Security with Cryptography & Steganography
 
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The first recorded use of the term was in 1499 by Johannes Trithemius in his Steganographia, a treatise on cryptography and steganography, disguised as a book on magic.
Symmetric Key Cryptography VS Asymmetric Key Cryptography | Private vs Public Key Cryptography
 
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Understand the working of Symmetric Key Cryptography and Asymmetric Key Cryptography in detail with working and difference between the 2 types. Symmetric Key Cryptography(Private Key Cryptography) - 1. In symmetric-key cryptography, the same key is used by the sender (for encryption) and the receiver(for decryption). 2. The key is shared. 3. The key is Secret and kept Private between the Sender & Receiver 4. For N users in a network the number of keys required is - N(N-1)/2 Asymmetric Key Cryptography(Public Key Cryptography) 1. In asymmetric-key cryptography, 2 different keys are used. 1 for Encryption & 1 for Decryption. 2. Every communicating party needs just a key pair. 3. One of the two keys is called as Public Key and the other is the Private Key. 4. Private key remains as a secret. Public key is for the general public. 5. Only the corresponding public private key pair and encrypt and decrypt messages and no other key can be used. 6. For N users in a network the number of keys required is - N*2. Complete Network Security / Information Security Playlist - https://www.youtube.com/watch?v=IkfggBVUJxY&list=PLIY8eNdw5tW_7-QrsY_n9nC0Xfhs1tLEK Download my FREE Network Security Android App - https://play.google.com/store/apps/details?id=com.intelisenze.networksecuritytutorials Simple Snippets Official Website - https://simplesnippets.tech/ Simple Snippets on Facebook - https://www.facebook.com/simplesnippets/ Simple Snippets on Instagram - https://www.instagram.com/simplesnippets/ Simple Snippets on Twitter - https://twitter.com/simplesnippet Simple Snippets Google Plus Page - https://plus.google.com/+SimpleSnippets Simple Snippets email ID - [email protected] For More Technology News, Latest Updates and Blog articles visit our Official Website - https://simplesnippets.tech/
Views: 277 Simple Snippets
Lecture 9: Modes of Operation for Block Ciphers by Christof Paar
 
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For slides, a problem set and more on learning cryptography, visit www.crypto-textbook.com
How Hash Algorithms Work – Bitcoin Hash Algorithm Explained
 
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How does hash algorithms actually work? Blockchain and Bitcoin utilise hash algorithms, but they can be somewhat hard to understand. This video aims to explain how these algorithms work, and what they are used for. PEACE! ---------------------------------------------------------------------------------------------- JOIN NO PMO NATION 👬: ---------------------------------------------------------------------------------------------- 👬 Instagram: https://www.instagram.com/nopmonation/ ---------------------------------------------------------------------------------------------- JOIN THE ARMY OF HAPPIER AND STRONGER PEOPLE 👬: ---------------------------------------------------------------------------------------------- 🎓 SUBSCRIBE ON YOUTUBE: https://goo.gl/JDWLKZ 🎓 JOIN US ON SLACK: https://goo.gl/srBTka 🎓 JOIN MY EXCLUSIVE MAILING LIST: http://eepurl.com/di4dNj ---------------------------------------------------------------------------------------------- POPULAR EDUCATION SERIES 💝: ---------------------------------------------------------------------------------------------- 🎓 MASTER NOFAP: https://goo.gl/z6E6HU 🎓 BECOME HAPPIER: https://goo.gl/DZ4cps 🎓 ATTRACT WOMEN: https://goo.gl/MKxdeS 🎓 MACHINE LEARNING: https://goo.gl/hULpKQ 🎓 ARTIFICIAL INTELLIGENCE: https://goo.gl/pzCWpU ---------------------------------------------------------------------------------------------- HOW TO ASK OSCAR QUESTIONS 🎤: ---------------------------------------------------------------------------------------------- 👬 MESSAGE ME ON INSTAGRAM: https://www.instagram.com/oscaralsing/ 👬 ASK ME ON SLACK: https://goo.gl/srBTka Linkedin: https://www.linkedin.com/in/oscaralsing/ Facebook: https://www.facebook.com/oscaralsingcom Website: http://www.oscaralsing.com ---------------------------------------------------------------------------------------------- PRODUCTS I LOVE ❤️: ---------------------------------------------------------------------------------------------- LIFE-CHANGING BOOKS: https://goo.gl/MMH4XG MY CAMERA/PROGRAMMING GEAR: https://goo.gl/WPCkZr ---------------------------------------------------------------------------------------------- ABOUT OSCAR 💝: ---------------------------------------------------------------------------------------------- Oscar is a leader, educator and programmer specialised in Artificial Intelligence and Machine Learning who strives to build a world where all leadership spawns from an intrinsic compassion for others. He is heavily interest in mindfulness and meditation and is a daily Brazilian Jiu-Jitsu practitioner. Furthermore, he Loves lifting heavy things and reads a lot of books and believes in a world where compassion and mutual understanding and respect permeate all of our actions. 🎉 Leader of the Year (2017, All Swedish Students) 🎉 10/100 @ Sweden's Top Future 100 Leaders 2018 🎉 37/100 @ Sweden's Top Future 100 Leaders 2017
Views: 1882 Oscar Alsing
Algorithm Modes & Algorithm Types in Network Security - ECB | CBC | CFC | OFB | CTR
 
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In this network security video tutorial we will study and understand the different types of algorithms and the different modes in which these algorithms work. An algorithm type is basically how the algorithm operates on the plain text to get the cipher text. It can be classified into 2 categories - 1. Stream Ciphers - Stream cipher techniques involves the encryption of plain text one bit at a time and decryption also happens one bit at a time. 2. Block Ciphers - Block cipher techniques involves the encryption of plain text one block(64 bit or some fixed size) at a time and decryption also happens one block at a time. Algorithm modes - An Algorithm mode is a combination of a series of the basic algorithm steps on block cipher and some kind of feedback from the previous step. In general there are 5 different types of algorithm modes in NS- 1. Electronic Code Book (ECB) 2. Cipher Block Chaining (CBC) 3. Cipher Feedback (CFC) 4. Output Feedback (OFB) 5. Counter Mode (CTR) Complete Network Security / Information Security Playlist - https://www.youtube.com/watch?v=IkfggBVUJxY&list=PLIY8eNdw5tW_7-QrsY_n9nC0Xfhs1tLEK Download my FREE Network Security Android App - https://play.google.com/store/apps/details?id=com.intelisenze.networksecuritytutorials Simple Snippets Official Website - https://simplesnippets.tech/ Simple Snippets on Facebook - https://www.facebook.com/simplesnippets/ Simple Snippets on Instagram - https://www.instagram.com/simplesnippets/ Simple Snippets on Twitter - https://twitter.com/simplesnippet Simple Snippets Google Plus Page - https://plus.google.com/+SimpleSnippets Simple Snippets email ID - [email protected] For More Technology News, Latest Updates and Blog articles visit our Official Website - https://simplesnippets.tech/
Views: 249 Simple Snippets
Bitcoin Q&A: Cryptographic primitives
 
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How are cryptographic primitives employed in Bitcoin? What are hashes and digital signatures? How does elliptic curve cryptography work? See details in Chapters 4 and 6 of 'Mastering Bitcoin': https://github.com/bitcoinbook/bitcoinbook/blob/f8b883dcd4e3d1b9adf40fed59b7e898fbd9241f/ch04.asciidoc https://github.com/bitcoinbook/bitcoinbook/blob/f8b883dcd4e3d1b9adf40fed59b7e898fbd9241f/ch06.asciidoc#digital_sigs These questions are from the MOOC 9.3 session which took place on March 2nd 2018. Andreas is a teaching fellow with the University of Nicosia. The first course in their Master of Science in Digital Currency degree, DFIN-511: Introduction to Digital Currencies, is offered for free as an open enrollment MOOC course to anyone interested in learning about the fundamental principles. If you want early-access to talks and a chance to participate in the monthly live Q&As with Andreas, become a patron: https://www.patreon.com/aantonop RELATED: Introduction to Bitcoin - https://youtu.be/l1si5ZWLgy0 Bitcoin: Where the Laws of Mathematics Prevail - https://youtu.be/HaJ1hvon0E0 Advanced Bitcoin Scripting: Transactions and Multisig - https://youtu.be/8FeAXjkmDcQ The war on cash and crypto - https://youtu.be/BAlRKfvBnvw MimbleWimble and Schnorr signatures - https://youtu.be/qloq75ekxv0 Mixing services - https://youtu.be/rKoMvOH4zoY Atomic swaps - https://youtu.be/fNFBA2UmUmg Directed acyclic graphs (DAGs) and IOTA - https://youtu.be/lfgMnbb5JeM Decentralised exchanges with fiat - https://youtu.be/3Url8tbQEkA Decentralised exchanges and counterparty risk - https://youtu.be/hi_jaw0dT9M The Lightning Network - https://www.youtube.com/playlist?list=PLPQwGV1aLnTurL4wU_y3jOhBi9rrpsYyi Secure, tiered storage system - https://youtu.be/uYIVuZgN95M Using paper wallets - https://youtu.be/cKehFazo8Pw Re-using addresses - https://youtu.be/4A3urPFkx8g How to get people to care about security - https://youtu.be/Ji1lS9NMz1E Migrating to post-quantum cryptography - https://youtu.be/dkXKpMku5QY Andreas M. Antonopoulos is a technologist and serial entrepreneur who has become one of the most well-known and respected figures in bitcoin. Follow on Twitter: @aantonop https://twitter.com/aantonop Website: https://antonopoulos.com/ He is the author of two books: “Mastering Bitcoin,” published by O’Reilly Media and considered the best technical guide to bitcoin; “The Internet of Money,” a book about why bitcoin matters. THE INTERNET OF MONEY, v1: https://www.amazon.co.uk/Internet-Money-collection-Andreas-Antonopoulos/dp/1537000454/ref=asap_bc?ie=UTF8 [NEW] THE INTERNET OF MONEY, v2: https://www.amazon.com/Internet-Money-Andreas-M-Antonopoulos/dp/194791006X/ref=asap_bc?ie=UTF8 MASTERING BITCOIN: https://www.amazon.co.uk/Mastering-Bitcoin-Unlocking-Digital-Cryptocurrencies/dp/1449374042 [NEW] MASTERING BITCOIN, 2nd Edition: https://www.amazon.com/Mastering-Bitcoin-Programming-Open-Blockchain/dp/1491954388 Subscribe to the channel to learn more about Bitcoin & open blockchains! Music: "Unbounded" by Orfan (https://www.facebook.com/Orfan/) Outro Graphics: Phneep (http://www.phneep.com/) Outro Art: Rock Barcellos (http://www.rockincomics.com.br/)
Views: 6739 aantonop
Bitcoin Q&A: Schnorr signatures and the privacy roadmap
 
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How important are privacy improvements to Bitcoin in the roadmap? How will second layers and atomic swaps help with this? When will Schnorr signatures / signature aggregation be added to Bitcoin? What are Taproot and Graftroot? Will it be done through a soft or hard fork? Should we keep transaction transparency instead of adding privacy features? Watch Pieter Wuille's presentation - https://youtu.be/YSUVRj8iznU Schnorr signature BIP - https://github.com/sipa/bips/blob/bip-schnorr/bip-schnorr.mediawiki CORRECTION / CLARIFICATION: At 3:47, I mention that Schnorr signatures had to overcome "patent encumbrances" and guessed that the patent expired somewhere around 2010. The precise expiration date of the U.S. Patent (No. 4,995,082) was February 2008. At 4:22, I say that ECDSA and EC-Schnorr are based on the difficulty of solving the discrete logarithm problem over a prime-order field. While this is true for the digital signature algorithm (DSA), ECDSA and Schnorr are based on the discrete log problem over an elliptic curve group. (h/t 'Daira Hopwood') These questions were part of the monthly live Patreon Q&A session in July and the Denver event as part of 'The Internet of Money Tour' at the Hilton Denver Inverness, which took place on July 28th and August 6th 2018 respectively. If you want early-access to talks and a chance to participate in the monthly live Q&As with Andreas, become a patron: https://www.patreon.com/aantonop RELATED: Worse than Useless: Financial Surveillance - https://youtu.be/n4F-h4xuXMk Money as a System-of-Control - https://youtu.be/FyK4P7ZdOK8 The Stories We Tell About Money - https://youtu.be/ONvg9SbauMg Bitcoin: Privacy, Identity, Surveillance and Money - https://youtu.be/Vcvl5piGlYg ADISummit: Self-Sovereign Identity Panel - https://youtu.be/DZbyiJqKT8c How is fungibility tied to privacy? - https://youtu.be/VuI-8EwqIS8 Public keys versus addresses - https://youtu.be/8es3qQWkEiU Re-using addresses - https://youtu.be/4A3urPFkx8g Coin selection and privacy - https://youtu.be/3Ck683CQGAQ Airdrop coins and privacy implications - https://youtu.be/JHRnqJJ0rhc Wallet design and mass adoption - https://youtu.be/WbZX6BDZJHc How do I choose a wallet? - https://youtu.be/tN6b62sEpsY Using paper wallets - https://youtu.be/cKehFazo8Pw Exchanges, identity, and surveillance - https://youtu.be/TVFy8xXfxAA The price of losing privacy - https://youtu.be/2G8IgiLbT_4 Layered scaling and privacy - https://youtu.be/4w-bjUhpf_Q Lightning and onion routing - https://youtu.be/D-nKuInDq6g What is the roadmap? - https://youtu.be/5Eoj_sKyC90 SegWit and fork research - https://youtu.be/OorLoi01KEE MimbleWimble and Schnorr signatures - https://youtu.be/qloq75ekxv0 Block capacity and embedded data - https://youtu.be/JXt0v54nojI Mixing services - https://youtu.be/rKoMvOH4zoY Borderless money - https://youtu.be/EZh1-ZqffOw Andreas M. Antonopoulos is a technologist and serial entrepreneur who has become one of the most well-known and respected figures in bitcoin. Follow on Twitter: @aantonop https://twitter.com/aantonop Website: https://antonopoulos.com/ He is the author of two books: “Mastering Bitcoin,” published by O’Reilly Media and considered the best technical guide to bitcoin; “The Internet of Money,” a book about why bitcoin matters. THE INTERNET OF MONEY, v1: https://www.amazon.co.uk/Internet-Money-collection-Andreas-Antonopoulos/dp/1537000454/ref=asap_bc?ie=UTF8 [NEW] THE INTERNET OF MONEY, v2: https://www.amazon.com/Internet-Money-Andreas-M-Antonopoulos/dp/194791006X/ref=asap_bc?ie=UTF8 MASTERING BITCOIN: https://www.amazon.co.uk/Mastering-Bitcoin-Unlocking-Digital-Cryptocurrencies/dp/1449374042 [NEW] MASTERING BITCOIN, 2nd Edition: https://www.amazon.com/Mastering-Bitcoin-Programming-Open-Blockchain/dp/1491954388 Translations of MASTERING BITCOIN: https://bitcoinbook.info/translations-of-mastering-bitcoin/ Subscribe to the channel to learn more about Bitcoin & open blockchains! Music: "Unbounded" by Orfan (https://www.facebook.com/Orfan/) Outro Graphics: Phneep (http://www.phneep.com/) Outro Art: Rock Barcellos (http://www.rockincomics.com.br/)
Views: 9989 aantonop
ITSA LECTURE 3 (DIGITAL SIGNATURE ,HASH FUNCTION ,MESSEGE DIGEST DEFINED)
 
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ITSA LECTURE 3 (DIGITAL SIGNATURE ,HASH FUNCTION ,MESSEGE DIGEST DEFINED)
Views: 1539 LectureDekho.com
Math Project Elgamal Algorithm Cipher
 
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Citations https://www.linkedin.com/pub/taher-elgamal/39/300/722 http://www.usna.edu/Users/math/wdj/_files/documents/book/node48.html .
Views: 484 McCall Cohen
Fang Song - A Note on Quantum Security for Post-Quantum Cryptography
 
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IQC member Fang Song presented a talk titled: A Note on Quantum Security for Post-Quantum Cryptography at the 2014 PQCrypto conference in October, 2014. Abstract: Shor's quantum factoring algorithm and a few other efficient quantum algorithms break many classical crypto-systems. In response, people proposed post-quantum cryptography based on computational problems that are believed hard even for quantum computers. However, security of these schemes against quantum attacks is elusive. This is because existing security analysis (almost) only deals with classical attackers and arguing security in the presence of quantum adversaries is challenging due to unique quantum features such as no-cloning. This work proposes a general framework to study which classical security proofs can be restored in the quantum setting. Basically, we split a security proof into (a sequence of) classical security reductions, and investigate what security reductions are "quantum-friendly". We characterize sufficient conditions such that a classical reductions can be "lifted" to the quantum setting. We then apply our lifting theorems to post-quantum signature schemes. We are able to show that the classical generic construction of hash-tree based signatures from one-way functions that are resistant to efficient quantum inversion algorithms, there exists a quantum-secure signature scheme. We note that the scheme in [10] is a promising (post-quantum) candidate to be implemented in practice and our result further justifies it. Actually, to obtain these results, we formalize a simple criteria, which is motivated by many classical proofs in the literature and is straight-forward to check. This makes our lifting theorem easier to apply, and it should be useful elsewhere to prove quantum security of proposed post-quantum cryptographic schemes. Finally we demonstrate the generality of our framework by showing that several existing works (Full-Domain hash in the quantum random-oracle model [47] and the simple hybrid arguments framework in [23]) can be reformulated under our unified framework. PQCrypto 2014 Book: http://www.springer.com/computer/security+and+cryptology/book/978-3-319-11658-7 Workshop: https://pqcrypto2014.uwaterloo.ca/ Find out more about IQC! Website - https://uwaterloo.ca/institute-for-qu... Facebook - https://www.facebook.com/QuantumIQC Twitter - https://twitter.com/QuantumIQC
Data Encryption - CompTIA Security+ SY0-401: 4.4
 
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Security+ Training Course Index: http://professormesser.link/sy0401 Professor Messer’s Course Notes: http://professormesser.link/sy0401cn Frequently Asked Questions: http://professormesser.link/faq - - - - - If you want to keep your data safe, then you need to encrypt it. In this video, you’ll learn about encrypting full-disks, databases, individual files, removable media, and data on mobile devices. - - - - - Download entire video course: http://professormesser.link/401adyt Get the course on MP3 audio: http://professormesser.link/401vdyt Subscribe to get the latest videos: http://professormesser.link/yt Calendar of live events: http://www.professormesser.com/calendar/ FOLLOW PROFESSOR MESSER: Professor Messer official website: http://www.professormesser.com/ Twitter: http://www.professormesser.com/twitter Facebook: http://www.professormesser.com/facebook Instagram: http://www.professormesser.com/instagram Google +: http://www.professormesser.com/googleplus
Views: 20201 Professor Messer
Yasufumi Hashimoto - Cryptanalysis of the Multivariate Signature Scheme Proposed in  PQCryptop 2013
 
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Yasufumi Hashimoto of the University of Ryukyus presented a talk titled: Cryptanalysis of the multivariate signature scheme proposed in PQCrypto 2013 at the 2014 PQCrypto conference in October, 2014. Abstract: In PQCrypto 2013, Yasuda, Takagi and Sakurai proposed a new signature scheme as one of multivariate public key cryptosystems (MPKCs). This scheme (called YTS) is based on the fact that there are two isometry classes of non-degenerate quadratic forms on a vector space with a prescribed dimension. The advantage of YTS is its efficiency . In fact, its signature generation is eight or nine times faster than Rainbow of similar size. For the security, it is known that the direct attack, the IP attack and the min-rank attack are applicable on YTS, and the running times are exponential time for the first and the second attacks and subexponential time for the third attack. In the present paper, we give a new attack on YTS using an approach similar to the diagonalization of a matrix. Our attack works in polynomial time and it actually recovers equivalent secret keys of YTS having 140-bits security against min-rank attack in several minutes. PQCrypto 2014 Book: http://www.springer.com/computer/security+and+cryptology/book/978-3-319-11658-7 Workshop: https://pqcrypto2014.uwaterloo.ca/ Find out more about IQC! Website - https://uwaterloo.ca/institute-for-qu... Facebook - https://www.facebook.com/QuantumIQC Twitter - https://twitter.com/QuantumIQC
Certificates on the Internet
 
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This is a very brief explanation and example of how digital certificates work on the Internet, such as when buying a book from Amazon.
Views: 242 Daniel Benway
Advanced Bitcoin Scripting -- Part 1: Transactions & Multisig
 
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This is the first part of a more technical talk where Andreas explores Bitcoin script, with examples from the 2nd edition of Mastering Bitcoin, focusing on the use of conditional statements, flow control, guard clauses and time locks. The examples will include advanced multi-signature scripts, hash time lock contracts and asymmetric revocable commitments. Then he answers questions about Bitcoin's quirky bugs, where Bitcoin differs from Ethereum at a scripting level, how SegWit works, how consensus rules change, and whether Bitcoin is more than just a currency. Watch Part 2 here: https://youtu.be/pQbeBduVQ4I This talk took place at the San Francisco Bitcoin Developer (@SFBitcoinDev) meetup on April 3rd, 2017: https://www.meetup.com/SF-Bitcoin-Devs/events/238773843/ Review materials on the topics presented: Chpt. 7: https://github.com/bitcoinbook/bitcoinbook/blob/develop/ch07.asciidoc Chpt. 12: https://github.com/bitcoinbook/bitcoinbook/blob/develop/ch12.asciidoc The fundamentals of Bitcoin script 2:17 Bitcoin's operators 5:00 Creating transactions (P2PKH - Pay to Public Key Hash) 6:30 Public Key CheckSigs, security by obfuscating public keys 7:42 Redeeming the script 9:05 The RIPEMD160 hash operation 12:05 OP_EQUALVERIFY, OP_CHECKSIG, & the elliptic curve digital signature algorithm (ECDSA) 14:05 Summary 18:30 Illustrating scripts: Equal, EqualVerify, CheckSig, CheckVerify, CheckMultisig, CheckLockTimeVerify 19:45 Guard clauses 23:02 Script-based timelocks 24:53 Flow control statements, interactive artificial intelligence 26:50 If, Else, EndIf 28:35 Unlocking scripts, what conditional flows do in Bitcoin 33:55 1-of-2 multi-signature script 35:44 1-of-2 multi-signature script with guard clause 38:28 2-of-3 multi-signature script 41:30 2-of-3 multi-signature script with timelock guard clause 43:20 BIP-113, how time is referenced in Bitcoin 44:42 Backup clause & other nuances in multi-signature schemes 46:58 Game theory, complexity from simplicity 52:36 2-of-3 multi-signature script, unlocking 53:45 RELATED: Bitcoin: Where the Laws of Mathematics Prevail - https://youtu.be/HaJ1hvon0E0 The rules of Bitcoin (part 1) - https://youtu.be/VnQu4uylfOs The rules of Bitcoin (part 2) - https://youtu.be/vtIp0GP4w1E Forkology: A Study of Forks for Newbies - https://youtu.be/rpeceXY1QBM Irreversibility and consumer protection - https://youtu.be/R107YWu5XzU Andreas M. Antonopoulos is a technologist and serial entrepreneur who has become one of the most well-known and well-respected figures in bitcoin. Follow on Twitter: @aantonop https://twitter.com/aantonop Website: https://antonopoulos.com/ He is the author of two books: “Mastering Bitcoin,” published by O’Reilly Media and considered the best technical guide to bitcoin; “The Internet of Money,” a book about why bitcoin matters. THE INTERNET OF MONEY, v1: https://www.amazon.co.uk/Internet-Money-collection-Andreas-Antonopoulos/dp/1537000454/ref=asap_bc?ie=UTF8 MASTERING BITCOIN: https://www.amazon.co.uk/Mastering-Bitcoin-Unlocking-Digital-Cryptocurrencies/dp/1449374042 [NEW] MASTERING BITCOIN, 2nd Edition: https://www.amazon.com/Mastering-Bitcoin-Programming-Open-Blockchain/dp/1491954388 Subscribe to the channel to learn more about Bitcoin & open blockchains! If you want early-access to talks and a chance to participate in a monthly LIVE Q&A with Andreas, become a patron: https://www.patreon.com/aantonop Music: "Unbounded" by Orfan (https://www.facebook.com/Orfan/) Outro Graphics: Phneep (http://www.phneep.com/) Outro Art: Rock Barcellos (http://www.rockincomics.com.br/)
Views: 28455 aantonop
Bitcoin Q&A: What is a private key?
 
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What is a private key? How are they generated and formatted? Are private keys transmitted when you make a transaction? What are the chances of collision? Will quantum computing making it easy to guess private keys? Does implementing quantum-proof algorithms require an overhaul of the code? Learn more from the following chapters of 'Mastering Bitcoin': https://github.com/bitcoinbook/bitcoinbook/blob/f8b883dcd4e3d1b9adf40fed59b7e898fbd9241f/ch04.asciidoc https://github.com/bitcoinbook/bitcoinbook/blob/f8b883dcd4e3d1b9adf40fed59b7e898fbd9241f/ch05.asciidoc Key to address code: https://github.com/bitcoinbook/bitcoinbook/blob/35f1c62f192dd0eaf1b1c462f88a46e0f5942e16/code/key-to-address-ecc-example.py These questions are from the MOOC 9.3 and 9.4 sessions, as well as the (rescheduled) April Patreon Q&A session, which took place on March 2nd, March 9th, and May 5th 2018 respectively. Andreas is a teaching fellow with the University of Nicosia. The first course in their Master of Science in Digital Currency degree, DFIN-511: Introduction to Digital Currencies, is offered for free as an open enrollment MOOC course to anyone interested in learning about the fundamental principles. If you want early-access to talks and a chance to participate in the monthly live Q&As with Andreas, become a patron: https://www.patreon.com/aantonop RELATED: Bitcoin: Where the Laws of Mathematics Prevail - https://youtu.be/HaJ1hvon0E0 Advanced Bitcoin Scripting Part 1: Transactions & Multisig - https://youtu.be/8FeAXjkmDcQ Advanced Bitcoin Scripting Part 2: SegWit, Consensus, and Trustware - https://youtu.be/pQbeBduVQ4I Cryptographic primitives - https://youtu.be/RIckQ6RBt5E Nonces, mining, and quantum computing - https://youtu.be/d4xXJh677J0 Public keys vs. addresses - https://youtu.be/8es3qQWkEiU Re-using addresses - https://youtu.be/4A3urPFkx8g What happens to our bitcoins during a hard fork? - https://youtu.be/sNR76fWd7-0 How do mnemonic seeds work? - https://youtu.be/wWCIQFNf_8g Multi-signature and distributed storage - https://youtu.be/cAP2u6w_1-k What is Segregated Witness? - https://youtu.be/dtOjjB4mD8k SegWit and fork research - https://youtu.be/OorLoi01KEE Forkology: A Study of Forks for Newbies - https://youtu.be/rpeceXY1QBM MimbleWimble and Schnorr signatures - https://youtu.be/qloq75ekxv0 Protocol development security - https://youtu.be/4fsL5XWsTJ4 Migrating to post-quantum cryptography - https://youtu.be/dkXKpMku5QY Andreas M. Antonopoulos is a technologist and serial entrepreneur who has become one of the most well-known and respected figures in bitcoin. Follow on Twitter: @aantonop https://twitter.com/aantonop Website: https://antonopoulos.com/ He is the author of two books: “Mastering Bitcoin,” published by O’Reilly Media and considered the best technical guide to bitcoin; “The Internet of Money,” a book about why bitcoin matters. THE INTERNET OF MONEY, v1: https://www.amazon.co.uk/Internet-Money-collection-Andreas-Antonopoulos/dp/1537000454/ref=asap_bc?ie=UTF8 [NEW] THE INTERNET OF MONEY, v2: https://www.amazon.com/Internet-Money-Andreas-M-Antonopoulos/dp/194791006X/ref=asap_bc?ie=UTF8 MASTERING BITCOIN: https://www.amazon.co.uk/Mastering-Bitcoin-Unlocking-Digital-Cryptocurrencies/dp/1449374042 [NEW] MASTERING BITCOIN, 2nd Edition: https://www.amazon.com/Mastering-Bitcoin-Programming-Open-Blockchain/dp/1491954388 Translations of MASTERING BITCOIN: https://bitcoinbook.info/translations-of-mastering-bitcoin/ Subscribe to the channel to learn more about Bitcoin & open blockchains! Music: "Unbounded" by Orfan (https://www.facebook.com/Orfan/) Outro Graphics: Phneep (http://www.phneep.com/) Outro Art: Rock Barcellos (http://www.rockincomics.com.br/)
Views: 7353 aantonop
Bitcoin Q&A: Protocol development security
 
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What are the odds of "rogue developers" who introduce vulnerabilities? What happens if the digital signature algorithm is compromised? Is trust in hardware wallet developers and the firmware update process a problem? Note: I was mostly talking about Bitcoin and other popular open blockchains which have a large development communities and a robust review process before any new code is put in production. The risk of vulnerabilities introduced by developers is different for each project, and having open-source code does not prevent it if no one is reading or testing it. These questions were part of the monthly live Patreon Q&A session for April (rescheduled to May 5th). If you want early-access to talks and a chance to participate in the monthly live Q&As with Andreas, become a patron: https://www.patreon.com/aantonop RELATED: Software distribution security - https://youtu.be/_V0vqy046YM Geopolitics and state-sponsored attacks - https://youtu.be/htxPRTJLK-k How to get people to care about security - https://youtu.be/Ji1lS9NMz1E What is the roadmap? - https://youtu.be/5Eoj_sKyC90 Why developers are leaving banks - https://youtu.be/GqOZ4IAQ-xQ Honest nodes and consensus - https://youtu.be/KAhY2ymI-tg Why running a node is important - https://youtu.be/oX0Yrv-6jVs Lessons from the hard fork - https://youtu.be/hnAWAVNnGCw Cryptographic primitives - https://youtu.be/RIckQ6RBt5E Nonces, mining, and quantum computing - https://youtu.be/d4xXJh677J0 Public keys vs. addresses - https://youtu.be/8es3qQWkEiU Re-using addresses - https://youtu.be/4A3urPFkx8g Using paper wallets - https://youtu.be/cKehFazo8Pw Wallet design and mass adoption - https://youtu.be/WbZX6BDZJHc Secure, tiered storage system - https://youtu.be/uYIVuZgN95M The Courage to Innovate Without Permission - https://youtu.be/ywq6NBETUJ8 What is Consensus: Rules Without Rulers - https://youtu.be/2tqo7PX5Pyc Decentralized Truth - https://youtu.be/XCVaabu3J04 Andreas M. Antonopoulos is a technologist and serial entrepreneur who has become one of the most well-known and respected figures in bitcoin. Follow on Twitter: @aantonop https://twitter.com/aantonop Website: https://antonopoulos.com/ He is the author of two books: “Mastering Bitcoin,” published by O’Reilly Media and considered the best technical guide to bitcoin; “The Internet of Money,” a book about why bitcoin matters. THE INTERNET OF MONEY, v1: https://www.amazon.co.uk/Internet-Money-collection-Andreas-Antonopoulos/dp/1537000454/ref=asap_bc?ie=UTF8 [NEW] THE INTERNET OF MONEY, v2: https://www.amazon.com/Internet-Money-Andreas-M-Antonopoulos/dp/194791006X/ref=asap_bc?ie=UTF8 MASTERING BITCOIN: https://www.amazon.co.uk/Mastering-Bitcoin-Unlocking-Digital-Cryptocurrencies/dp/1449374042 [NEW] MASTERING BITCOIN, 2nd Edition: https://www.amazon.com/Mastering-Bitcoin-Programming-Open-Blockchain/dp/1491954388 Translations of MASTERING BITCOIN: https://bitcoinbook.info/translations-of-mastering-bitcoin/ Subscribe to the channel to learn more about Bitcoin & open blockchains! Music: "Unbounded" by Orfan (https://www.facebook.com/Orfan/) Outro Graphics: Phneep (http://www.phneep.com/) Outro Art: Rock Barcellos (http://www.rockincomics.com.br/)
Views: 5766 aantonop
John MacCormick's Nine Algorithms That Changed the Future
 
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Every day, we use our computers to perform remarkable feats. A simple web search picks out a handful of relevant needles from the world's biggest haystack: the billions of pages on the World Wide Web. Uploading a photo to Facebook transmits millions of pieces of information over numerous error-prone network links, yet somehow a perfect copy of the photo arrives intact. Without even knowing it, we use public-key cryptography to transmit secret information like credit card numbers; and we use digital signatures to verify the identity of the websites we visit. How do our computers perform these tasks with such ease? This is the first book to answer that question in language anyone can understand, revealing the extraordinary ideas that power our PCs, laptops, and smartphones. Using vivid examples, John MacCormick explains the fundamental "tricks" behind nine types of computer algorithms, including artificial intelligence (where we learn about the "nearest neighbor trick" and "twenty questions trick"), Google's famous PageRank algorithm (which uses the "random surfer trick"), data compression, error correction, and much more. These revolutionary algorithms have changed our world: this book unlocks their secrets, and lays bare the incredible ideas that our computers use every day. John MacCormick is a leading researcher and teacher of computer science. He has a PhD in computer vision from the University of Oxford, has worked in the research labs of Hewlett-Packard and Microsoft, and is currently a professor of computer science at Dickinson College.
Digital Signature Validation Problem
 
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E-District Certificate Validation Problems Kerala
Views: 45186 Jithin Raj
JC Deneuville - Sealing the Leak on Classical NTRU Signatures
 
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Jean-Christophe Deneuville of the XLIM Research Institute presented a talk titled: sealing the leak on classical NTRU signatures at the 2014 PQCrypto conference in October, 2014. Abstract: Initial attempts to obtain lattice based signatures were closely related to reducing a vector modulo the fundamental parallelepiped of a secret basis (like GGH [9], or NTRUSign [12]). This approach leaked some information on the secret, namely the shape, of the parallelepiped, which has been exploited on practical attacks [24]. NTRUSign was an extremely efficient scheme, and thus there has been a noticeable interest on developing countermeasures to the attacks, but with little success [6]. In [8] Gentry, Peikert and Vaikuntanathan proposed a randomized version of Babai's nearest plane algorithm such that the distribution of a reduced vector modulo a secret parallelepiped only depended on the size of the base used. Using this algorithm and generating large, close to uniform, public keys they managed to get provably secure GGH-like lattice-based signatures. Recently, Stehlé and Steinfeld obtained a provably secure scheme very close to NTRUSign [26] (from a theoretical point of view). In this paper, we present an alternative approach to seal the leak of NTRUSign. Instead of modifying the lattices and algorithms used,we do a classy leaky NTRUSign signature and hide it with gaussian noise using techniques present in Lyubashevsy's signatures. Our main contributions are thus a set of strong NTRUSign parameters, obtained by taking into account latest known attacks against the scheme, a statistical way to hide the leaky NTRU signature so that this particular instantiation of CVP-based signature scheme becomes zero-knowledge and secure against forgeries, based on the worst-case hardness of the õ (N1.5)-shortest Independent Vector Problem over NTRU lattices. Finally, we give a set of concrete parameters to gauge the efficiency of the obtained signature scheme. PQCrypto 2014 Book: http://www.springer.com/computer/security+and+cryptology/book/978-3-319-11658-7 Workshop: https://pqcrypto2014.uwaterloo.ca/ Find out more about IQC! Website - https://uwaterloo.ca/institute-for-qu... Facebook - https://www.facebook.com/QuantumIQC Twitter - https://twitter.com/QuantumIQC