Search results “Key exchange in public key cryptography ppt”

Modern day encryption is performed in two different ways. Check out http://YouTube.com/ITFreeTraining or http://itfreetraining.com for more of our always free training videos. Using the same key or using a pair of keys called the public and private keys. This video looks at how these systems work and how they can be used together to perform encryption.
Download the PDF handout
http://itfreetraining.com/Handouts/Ce...
Encryption Types
Encryption is the process of scrambling data so it cannot be read without a decryption key. Encryption prevents data being read by a 3rd party if it is intercepted by a 3rd party. The two encryption methods that are used today are symmetric and public key encryption.
Symmetric Key
Symmetric key encryption uses the same key to encrypt data as decrypt data. This is generally quite fast when compared with public key encryption. In order to protect the data, the key needs to be secured. If a 3rd party was able to gain access to the key, they could decrypt any data that was encrypt with that data. For this reason, a secure channel is required to transfer the key if you need to transfer data between two points. For example, if you encrypted data on a CD and mail it to another party, the key must also be transferred to the second party so that they can decrypt the data. This is often done using e-mail or the telephone. In a lot of cases, sending the data using one method and the key using another method is enough to protect the data as an attacker would need to get both in order to decrypt the data.
Public Key Encryption
This method of encryption uses two keys. One key is used to encrypt data and the other key is used to decrypt data. The advantage of this is that the public key can be downloaded by anyone. Anyone with the public key can encrypt data that can only be decrypted using a private key. This means the public key does not need to be secured. The private key does need to be keep in a safe place. The advantage of using such a system is the private key is not required by the other party to perform encryption. Since the private key does not need to be transferred to the second party there is no risk of the private key being intercepted by a 3rd party. Public Key encryption is slower when compared with symmetric key so it is not always suitable for every application. The math used is complex but to put it simply it uses the modulus or remainder operator. For example, if you wanted to solve X mod 5 = 2, the possible solutions would be 2, 7, 12 and so on. The private key provides additional information which allows the problem to be solved easily. The math is more complex and uses much larger numbers than this but basically public and private key encryption rely on the modulus operator to work.
Combing The Two
There are two reasons you want to combine the two. The first is that often communication will be broken into two steps. Key exchange and data exchange. For key exchange, to protect the key used in data exchange it is often encrypted using public key encryption. Although slower than symmetric key encryption, this method ensures the key cannot accessed by a 3rd party while being transferred. Since the key has been transferred using a secure channel, a symmetric key can be used for data exchange. In some cases, data exchange may be done using public key encryption. If this is the case, often the data exchange will be done using a small key size to reduce the processing time.
The second reason that both may be used is when a symmetric key is used and the key needs to be provided to multiple users. For example, if you are using encryption file system (EFS) this allows multiple users to access the same file, which includes recovery users. In order to make this possible, multiple copies of the same key are stored in the file and protected from being read by encrypting it with the public key of each user that requires access.
References
"Public-key cryptography" http://en.wikipedia.org/wiki/Public-k...
"Encryption" http://en.wikipedia.org/wiki/Encryption

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itfreetraining

How does public-key cryptography work? What is a private key and a public key? Why is asymmetric encryption different from symmetric encryption? I'll explain all of these in plain English!
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Simply Explained - Savjee

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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: 175695
Last moment tuitions

Easy explanation of "public key encryption".
Instead of the usual terms of "public key" and "private key" this tutorial uses "lock" and "key".
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Veet Vivarto

Concepts of public key cryptography. Course material via: http://sandilands.info/sgordon/teaching

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Steven Gordon

What is Public Key Cryptography? A kinetic text animation by Candle & Bell!

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CandleandBell

lll➤ Gratis Crypto-Coins: https://crypto-airdrops.de
) More about MAC and hash functions for authentication and Introduction to public key cryptography in this IT Lecture.
Public-key cryptography, also known as asymmetric cryptography, is a class of cryptographic algorithms which require two separate keys, one of which is secret (or private) and one of which is public.
http://en.wikipedia.org/wiki/Public-key_cryptography
This video was made by another YouTube user and made available for the use under the Creative Commons licence "CC-BY". His channel can be found here:
https://www.youtube.com/user/StevesLectures

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Lernvideos und Vorträge

This movie explains the concepts behind Digital Signatures and the various components of Public Key Infrastructure in layman's terms from the Indian Context.

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PKIIndia

Public key cryptography for authentication, digital signatures, key distribution. Course material via: http://sandilands.info/sgordon/teaching

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Steven Gordon

For slides, a problem set and more on learning cryptography, visit www.crypto-textbook.com

Views: 60503
Introduction to Cryptography by Christof Paar

Server-Aided Public Key Encryption

Views: 338
Chennai Sunday

Difference between Asymmetric Key and Symmetric Key Cryptography
Keywords:
Asymmetric Key Cryptography
Symmetric Key Cryptography
Network Security Notes

Views: 24534
Easy Engineering Classes

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Мария Китова

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Views: 0
Мария Китова

Public key cryptography and digital signatures. Lecture 6 of ITS335 IT Security at Sirindhorn International Institute of Technology, Thammasat University. Given on 28 November 2013 at Bangkadi, Pathumthani, Thailand by Steven Gordon. Course material via: http://sandilands.info/sgordon/teaching

Views: 1944
Steven Gordon

Today we're going over Elliptic Curve Cryptography, particularly as it pertains to the Diffie-Hellman protocol. The ECC Digital Signing Algorithm was also discussed in a separate video concerning Bitcoin's cryptography.

Views: 45236
CSBreakdown

Full Video Details: http://www.securitytube.net/video/117

Views: 13276
TheSecurityTube

Patrick Townsend, Founder & CEO of Townsend Security, discusses encryption keys and how they are used, what key management systems are and how they are used, how key management systems are deployed, and the basic components of a key management system.

Views: 18013
Townsend Security

شرح كامل للتشفير و فك التشفير وعمل المفتاح عن طريق شيفرة RSA بطريقة مبسطة مع حل مثال.
- سيف بدران
Information Security and Privacy - RSA Cipher Key Creation + Encyption + Decryption Fully Explained with Example.
Done By: Saif Badran
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iTeam Academic Group - JU

Views: 47318
iAcademy

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Евгений Васин

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Views: 0
Мария Китова

Public Key cryptography chapter9 Reference william stallings presented by P.V.S Sriram Lecturer in MCA Dept KBN College.

Views: 189
sriram panjagala

Creating an app capable of generating values of public and private keys as well as encrypting and decrypting ciphertext messages based on two prime number inputs using the foundational principles of asymmetric key RSA encryption.
Special thanks to Khan Academy for several reference points throughout the video!!!
3:26: N is NOT part of the private key.
5:11: On powerpoint: 9, 6, and 3 all share factors with 9; 8, 7, 5, 4, 2, and 1 don't share factors with 9 that are greater than 1.
10:00: Video gets a little spotty here, so in case you can't hear, she's saying "It's easy to compute D given the value of Phi N, however . . ."
By: Sofia Flynn

Views: 1188
Sofia Flynn

Download this free Probably The Best public-key cryptography Guide To Date Powerpoint here:
https://theartofservice.com
Complete Toolkit at https://store.theartofservice.com/the-public-key-cryptography-toolkit.html
While Diffie and Hellman could not find such a system, they showed that public-key cryptography was indeed possible by presenting the Diffie–Hellman key exchange protocol, a solution that is now widely used in secure communications to allow two parties to secretly agree on a shared encryption key.

Views: 17
TheArtofService

For slides, a problem set and more on learning cryptography, visit www.crypto-textbook.com

Views: 46295
Introduction to Cryptography by Christof Paar

find relevant notes at-https://viden.io/

Views: 53073
LearnEveryone

Views: 0
Мария Китова

Paper by Nico Döttling and Sanjam Garg, presented at Crypto 2017. See https://iacr.org/cryptodb/data/paper.php?pubkey=28232

Views: 773
TheIACR

Jintai Ding of the University of Cincinnati and the Chinese Academy of Sciences presented a talk titled: ZHFE, a new multivariate public key encryption scheme at the 2014 PQCrypto conference in October, 2014.
Abstract: In this paper we propose a new multivariate public key encryption scheme named ZHFE. The public key is constructed using as core map two high rank HFE polynomials. The inversion of the public key is performed using a low degree polynomial of Hamming weight three. This low degree polynomial is obtained from the two high rank HFE polynomials, by means of a special reduction method that uses HFE polynomials. We show that ZHFE is relatively efficient and the it is secure against the main attacks that have threatened the security of HFE. We also propose parameters for a practical implementation of ZHFE.
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

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Institute for Quantum Computing

Views: 0
Мария Китова

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................................................................................................................Cryptography Windows Server (Operating System) Information Technology (Industry) Cryptography (Software Genre) Cryptographic Hash Function crash course computer science cryptography computer science http://www.hiteshchoudhary.com Security (Quotation Subject) Encryption and Decryption GNU/Linux (Operating System) rsa public key encryption university of nottingham euler's phi function cryptography algorithms cryptography techniques Public-key Cryptography Symmetric-key Algorithm Cryptography basics cryptography examples what is cryptography Hash Functions euler's theorem Hash Function what is encryption Encryption Engineering Mentor low power device Public cryptography ppt professor messer computer science Network Security Applied Crypto hitesh-choudhary cryptography pdf high resiliency time complexity Crash Course confidentiality shor''s Key rsa encryption ITFreeTraining monoalphabetic polyalphabetic computerphile CRYPTOGRAPHY Symmetric key rsa algorithm prime numbers certification cryptography vlogbrothers substitution mathematics low latency crashcourse encryption

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Евгений Васин

RSA Cryptosystem Algorithm (Public Key Algorithm) in Hindi with Example
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Easy Engineering Classes

This video helps in understading deffie-hellman key exchange.
You can access ppt using link https://drive.google.com/folderview?id=0B04GruwlNQdZfjlPVTdGbUV6VzR0SlNJdjZqN2xBZ3pRWlA3YXRna0pyNHVmT1RweWJ2R3c&usp=sharing

Views: 317
ayush anand

How does the RSA algorithm work? - RSA Algorithm in Cryptography,Example,Concept rsa algorithm,example ,What is a RSA key? rsa algorithm steps,rsa algorithm tutorialspoint, algorithm example with solution
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RSA key is a private key based on RSA algorithm. Private Key is used for authentication and a symmetric key exchange during establishment of an SSL/TLS session. It is a part of the public key infrastructure that is generally used in case of SSL certificates.
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Views: 0
Евгений Васин

How SSL works by leadingcoder.
This is a full tutorial how to setup SSL that requires client certificate for reference: http://www.windowsecurity.com/articles/Client-Certificate-Authentication-IIS6.html .

Views: 1275367
tubewar

This video lecture is produced by S. Saurabh. He is B.Tech from IIT and MS from USA.
RSA Algorithm and public key encryption | rivest shamir adleman algorithm
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Views: 4738
saurabhschool

Enroll to Full Course: https://goo.gl/liK0Oq
Networks#4: The video explains the RSA Algorithm (public key encryption) Concept and Example along with the steps to generate the public and private keys. The video also provides a simple example on how to calculate the keys and how to encrypt and decrypt the messages.
For more, visit http://www.EngineeringMentor.com.
FaceBook: https://www.facebook.com/EngineeringMentor.
Twitter: https://www.twitter.com/Engi_Mentor

Views: 154079
Skill Gurukul

Views: 0
Евгений Васин

Authentication with public key encryption and authentication via digital signature
Author: Jovan Jovanović, Singidunum University

Views: 1166
Saša Adamović

A short video attempting to explain the Bennett & Brassard quantum cryptography protocol.
I've omitted any mention of the particular details of quantum physics that would be involved in actual real-world implementations, such as particle polarization axes, spin, and so forth, instead replacing them with abstract "processes" and freakish mysterious "machines". The physical details (interesting though they are) are not needed to understand the basics of the protocol, and I'm no physicist, so I'd probably mess them up if I tried (assuming I haven't already!).
Making these images has increased my affection for Microsoft PowerPoint, and putting them all into a video has hugely exacerbated my hatred for Windows Movie Maker.
NOTE:
An important missing piece of information: When Alice sends qubits to Bob, she chooses between process A and process B randomly for each qubit.
NOTE 2:
The following video explains BB84 as well, and gives more detail regarding the physics details:
http://www.youtube.com/watch?v=7SMcf1MdOaQ
NOTE 3:
Here is another very interesting video about quantum cryptography. Any given real-world implementation, despite using the BB84 protocol, is bound to expose weaknesses that can be exploited. For example:
http://www.youtube.com/watch?v=T0WnUlF2eAo

Views: 41959
Creature Mann

A short video I put together that describes the basics of the Elliptic Curve Diffie-Hellman protocol for key exchanges.

Views: 97892
Robert Pierce

Diffie Hellman key Exchange algorithm with an example is explained in the above video.Diffie Hellman key Exchange algorithm is used to transfer keys or exchange keys between two partners.Diffie Hellman key Exchange algorithm is a public key exchange type of algorithm.Diffie Hellman key Exchange algorithm is widely used in situations where eavesdropping is present. i.e. the medium across which information is sent can be hacked easily and information can be obtained.Diffie-Hellman key exchange algorithm does not have an effect of eavesdropping and hence it becomes a secure mode of transmission of key.Thus key can be exchanged using the Diffie-Hellman key exchange algorithm.In this video I have tried to explain the algorithm.After explaining the Diffie Hellman key Exchange algorithm I have also put an example for better understanding.What makes Diffie Hellman key Exchange algorithm so powerful? What are the conditions which are to be checked before key exchange? These things have also been explained in the video.The example explained in the video will easily remove doubts about the Diffie Hellman key exchange algorithm.I hope you liked the video.

Views: 25944
denil saviour

Hackers steal data constantly, so protecting it is an ongoing challenge. Today's information encryption technology has been compromised and will be obsolete in just a few years. Quantum Key Distribution (QKD) technology can be proven by the laws of physics to help secure the sensitive data we deliver—today and into the future.

Views: 19379
BattelleInnovations

Fundamentals of Computer Network Security
This specialization in intended for IT professionals, computer programmers, managers, IT security professionals who like to move up ladder, who are seeking to develop network system security skills. Through four courses, we will cover the Design and Analyze Secure Networked Systems, Develop Secure Programs with Basic Cryptography and Crypto API, Hacking and Patching Web Applications, Perform Penetration Testing, and Secure Networked Systems with Firewall and IDS, which will prepare you to perform tasks as Cyber Security Engineer, IT Security Analyst, and Cyber Security Analyst.
course 2 Basic Cryptography and Programming with Crypto API:
About this course: In this MOOC, we will learn the basic concepts and principles of cryptography, apply basic cryptoanalysis to decrypt messages encrypted with mono-alphabetic substitution cipher, and discuss the strongest encryption technique of the one-time-pad and related quantum key distribution systems. We will also learn the efficient symmetric key cryptography algorithms for encrypting data, discuss the DES and AES standards, study the criteria for selecting AES standard, present the block cipher operating modes and discuss how they can prevent and detect the block swapping attacks, and examine how to defend against replay attacks. We will learn the Diffie-Hellman Symmetric Key Exchange Protocol to generate a symmetric key for two parties to communicate over insecure channel. We will learn the modular arithmetic and the Euler Totient Theorem to appreciate the RSA Asymmetric Crypto Algorithm, and use OpenSSL utility to realize the basic operations of RSA Crypto Algorithm. Armed with these knowledge, we learn how to use PHP Crypto API to write secure programs for encrypting and decrypting documents and for signing and verify documents. We then apply these techniques to enhance the registration process of a web site which ensures the account created is actually requested by the owner of the email account.
Module 2 - Symmetric Key Cryptography
In this module we present the basic mechanism of symmetric key crytography algorithms, discuss the DES and AES standard, describe the criteria for selecting AES standard, present the block cipher operating modes and discuss how the block swapping attacks and replay attacks can be prevented and detected.
Learning Objectives
• Understand the criteria for selecting crypto algorithms
• Perform cryptoanalysis on simple ciphers
• Select operating modes for symmetric encryption and to prevent block swapping and replay attacks
• Understand DES and AES standards and their buildig blocks
Subscribe at: https://www.coursera.org

Views: 137
intrigano

In this video I explain the fundamental concepts of cryptography. Encryption, decryption, plaintext, cipher text, and keys.
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Learn Math Tutorials

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/
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Institute for Quantum Computing

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