Search results “Symmetric-key cryptography java example”

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

Views: 451245
itfreetraining

In this video you will see how to encrypt and decrypt the text information using the AES algorithm in Java Cryptography.
For more tutorials visit: http://www.step2know.com

Views: 43456
Infinity

Ciphers in Java
five confidentiality modes of operation for symmetric key block cipher algorithms
The Electronic Codebook Mode (ECB)
The Cipher Block Chaining Mode (CBC)
The Cipher Feedback Mode (CFB)
The Output Feedback Mode (OFB)
The Counter Mode (CT)
Symmetric encryption example with padding and CBC using DES
Basic symmetric encryption example with padding
using the KeyGenerator

Views: 5285
Zariga Tongy

In this video you will see how to encrypt and decrypt the text information using the RSA algorithm in Java Cryptography.
For more tutorials visit: http://www.step2know.com

Views: 20220
Infinity

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Password Encryption.java
JAVA ENCRYPTION/DECRYPTION PROGRAM HELP
Encrypting and Decrypting Java
Cryptography using Java in Netbeans IDE
Cryptography using Java in Netbeans IDE
Java Cryptography APIs
Cryptography
Encrypting and Decrypting a text file in java

Views: 96265
ProgrammingKnowledge

We will create a primitive encryption algorithm and apply it to a String and a file.
P.S. I'm now using earphones' mic rather than the built-in laptop mic because of my (loud) surroundings. Let me know what you think.

Views: 1772
Almas Baimagambetov

This tutorial shows you how to encrypt a string with encryption keychains. If this helped, leave a like to show some love and subscribe if you haven't already done so ;)
Find all my tutorials at: http://indev0r.tk
Follow me on Twitter: @Indev0r
Check out my blog: http://indev0r.tumblr.com

Views: 23739
MrDeathJockey

+++See my latest video: Internet Security or Die+++ https://youtu.be/CzB5n6_pBfk
Learn Public Key Cryptography in just 18 Minutes - Cryptography Tutorial
In this Cryptography Tutorial, I teach you Public Key cryptography basics. Specifically I’m going to explain to you how the cryptography works, that allows you to do online shopping. We are so used to online shopping, a.k.a. e-commerce, that we take it for granted. But e-commerce would not be possible at all without public key cryptography. Not only will I explained to you the details of public-key cryptography and how that makes e-commerce possible, but I’m going to explain it in 15 minutes, and explain it without math, by using the Blackbox model.
IMHO, cryptography basics should not include math. Cryptography explained with math simply muddies the waters to those without extensive math background.
Let’s start by taking a brief look at Classic cryptography, which is been around for thousands of years. Classic cryptography is also called secret key cryptography or Symmetric cryptography.
A cipher is some sort of a mathematical algorithm that we use to scramble text. In the blackbox model the cipher itself is the blackbox into which we input plaintext and the key. The plaintext is the message that we wish to encrypt and the key is simply a string of numbers, generally binary ones and zeros. The output we get from the blackbox is called ciphertext, which is the plaintext that has been encrypted in such a way that it can only be decrypted by someone that has the same key that originally encrypted the data in the first place.
Some examples of Symmetric cryptography that are used today are DES, Triple DES & AES. These are the same as the ciphers used for thousands of years in that the same key encrypts and decrypts them. However the modern algorithm is much stronger.
If we use of good cipher such as AES the only way an attacker can decrypt the ciphertext is to try every possible key, called a brute force attack. That is why the longer the key the more security you get.
Now supposing Bob wants to buy something on the website Alice.com. He needs to make sure his personal information cannot be seen by anybody eavesdropping on his conversation over the public Internet. At first glance it seems easy enough for Bob to encrypt his plaintext personal information with Symmetric cryptography, using a secret key, send it across the Internet in an encrypted fashion, and then have Alice.com decrypt the information with the same secret key. The problem arises: how do Bob and Alice.com both get the same secret key, while making sure no one else gets the key? The answer is no one has ever thought of a very efficient way. In order to do this, a whole new type of encryption called public key encryption, a.k.a. Asymmetric encryption had to be invented first. In fact it was invented in the 1970s thousands of years after mankind first started using cryptography.

Views: 30360
Packethacks.com

Dow does block cipher encryption work? wonder no more :)
Excel File as requested by some of you: https://www.ieofit.com/youtube/DES.xlsx

Views: 13600
IEOFIT

Hi guys we will learn in this tutorial series about the basics of cryptography and how to implement it in java.
We will start with hashing to encryption and then to encoding.
In hashing we will be using SHA-1, in ecryption we will focus on AES-128 and for encoding we will use Apache's Base64 encoder and decoder.
Here we will implement the Code Block Chaining or CBC algorithim to understand Encryption in Java. We will understand what is IV parameter and what is its purpose and how to implement it here in java.
We will also see the decryption in the same.

Views: 1027
Code Digest With MrWallet

In this screencast, Jon Andrews from Redport Information Assurance explains the step by step process in creating a symmetric key in order to encrypt and decrypt messages.

Views: 2469
Redport Information Assurance

This video show you how to use previously written AES algorithm code to encrypt and decrypt the text.

Views: 26178
Infinity

Demonstration of using OpenSSL to create RSA public/private key pair, sign and encrypt messages using those keys and then decrypt and verify the received messages. Commands used: openssl. Created by Steven Gordon on 7 March 2012 at Sirindhorn International Institute of Technology, Thammasat University, Thailand.

Views: 60669
Steven Gordon

This video explains the Symmetric Key Encryption. For code refer http://www.java-redefined.com/2013/08/symmetric-key-encryption-decryption.html

Views: 503
Java Developer

Diffie Hellman Key Exchange in Hindi for Symmetric Key Encryption System – With Example
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Views: 44299
Easy Engineering Classes

Source Code Project http://microify.com/1Tgn
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Views: 14057
Melardev

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
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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: 249333
Last moment tuitions

Problem Solved from William Stallings
Book : Cryptography and Network Security
Fifth Editon

Views: 16779
Random Videos

Views: 103645
B Hariharan

This video will explain you in detail how caesar cipher encryption and decryption technique works.
This video includes solved example for caesar cipher encryption and decryption algorithm on whiteboard.
I had explained in detail about difficulties student might face while solving example related to caesar cipher in their examination.
More videos about encryption algorithms, computer tips and tricks, ethical hacking are coming very soon so share this video with your friends.
Subscribe to my youtube channel so that you can know when I upload any new video.
See you all very soon in next video, have great days ahead.
Thanks for watching my video.
#caesar #encryption #decryption

Views: 22787
SR COMPUTER EDUCATION

Learn to Encrypt and Decrypt data on Android Applications with the Advanced Encryption Standard (AES) Algorithm.
Note that this tutorial has been made by Tamil for the SSaurel's Channel. If you want to collaborate on the SSaurel's Channel, don't hesitate to send me your ideas for further details.
► Discover all the Android Apps offered by SSaurel Mobile Apps : https://play.google.com/store/apps/dev?id=6924401024188312025
► Learn to create Android Apps step by step on the SSaurel's Blog : https://www.ssaurel.com/blog
► Enter in the Bitcoin and cryptocurrency World : https://www.toutsurlebitcoin.fr

Views: 26210
Sylvain Saurel

Digital Signature - Asymmetric Key Cryptography, Why used for Authentication and Non Repudiation (Hindi)
Keywords:
Digital Signature
Asymmetric Encryption
Authentication
Non Repudiation

Views: 60043
Easy Engineering Classes

The tutorial is here:
https://asecuritysite.com/02_05_padding.pdf

Views: 1024
Bill Buchanan OBE

This tutorial will teach you how to encrypt and decrypt messages using the Caesar Cipher.-- Created using PowToon -- Free sign up at http://www.powtoon.com/ . Make your own animated videos and animated presentations for free. PowToon is a free tool that allows you to develop cool animated clips and animated presentations for your website, office meeting, sales pitch, nonprofit fundraiser, product launch, video resume, or anything else you could use an animated explainer video. PowToon's animation templates help you create animated presentations and animated explainer videos from scratch. Anyone can produce awesome animations quickly with PowToon, without the cost or hassle other professional animation services require.

Views: 129776
Lacey Wright

Author: Jeremy Druin
Twitter: @webpwnized
Description: A light introduction to using OpenSSL to symmetrically encrypt text. The AES cipher is used in the sample with a 256 key, a salt and cipher block chaining mode. The sample is decrypted as well. Encryption theory is not discussed. This is only a practical exercise in performing symmetric encryption. Thank you for watching. Please support this channel. Up vote, subscribe or even donate by clicking "Support" at https://www.youtube.com/user/webpwnized!

Views: 1912
webpwnized

RSA Cryptosystem Algorithm (Public Key Algorithm) in Hindi with Example
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Views: 93290
Easy Engineering Classes

Symmetric Key Encryption and Decryption

Views: 17
Cryptography & Cyber Security Solutions

RSA being a public key crypto-system has two keys, the Public key and the Private key. The Encryption is done using one and the decryption is done using the other. Normally, the encryption is done using the Public key and the decryption is done using the Private key. The RSA modulus (explained below) length is called the key length of the cipher. The currently largest factored prime number had 768 bit. As the security of RSA depends on the factoring problem, using a modulus of 1024 bits is a bare minimum. It is recommended to use at least 2048 bits for good security. 4096 bit is pretty much unbreakable, anything beyond 4096 bits is over the top and would also be painfully slow. #selfhostwcf, #p2pnetworkprogramming,#netcorecommerce

Views: 715
Freelance Web Developments

Understand the basics of cryptography and the concept of symmetric or private key and asymmetric or public key cryptography. Also, a simple example of how cryptography is applied in web browsers.
Link to "Applications of Public Key Cryptography" video: https://www.youtube.com/watch?v=Uk1mjEpW33s

Views: 6134
Biz Sci Tech

Learn how to control Java’s cryptographic features to protect your application and any data that you manage. This session explains what different cryptography features do, what threats are addressed by each feature, and where the configuration takes place. Topics include certificates, code signatures, authenticating dynamic JVM languages, TLS control, perfect forward security, and transparent JPA encryption.
Author:
Erik Costlow
Erik Costlow is a product manager in Oracle's Java Platform Group and a regular contributor to the Java Platform Group PM blog. Erik also works closely with industry on Oracle's Java Root Certificate Program to ensure highest program quality. Previously Erik was employed at HP where he influenced design of the Fortify security analysis suite used by software developers across the world.
View more trainings by Erik Costlow at https://www.parleys.com/author/erik-costlow
Find more related tutorials at https://www.parleys.com/category/developer-training-tutorials

Views: 10520
Oracle Developers

https://8gwifi.org/CipherFunctions.jsp
Reference book: http://leanpub.com/crypto
Cryptographic Algorithms generally fall into one of two different categories, or are a combination of both.
Symmetric
Fast
Only provide confidentiality
Examples: DES, AES, Blowfish, RC4, RC5
Asymmetric
Large mathematical operations make it slower than symmetric algorithms
No need for out of band key distribution (public keys are public!)
Scales better since only a single key pair needed per individual
Can provide authentication and nonrepudiation
Examples: RSA, El Gamal, ECC, Diffie-Hellman
problem with symmetric key cryptography
DES (Data Encryption Standard)
64 bit key that is effectively 56 bits in strength
Actual algorithm is called DEA (Data Encryption Algorithm)
DES Modes
Electronic Code Book
Cipher Block Chaining (most commonly used for general purpose encryption)
Cipher Feedback
Output Feedback
Counter Mode (used in IPSec)
3DES
112-bit effective key length
Uses either 2 or 3 different smaller keys in one of several modes
Modes
EEE2/3
EDE2/3
AES
NIST replaced DES in 1997 with this
Uses the Rijndael algorithm
Supports key/block sizes of 128, 192, and 256 bits
Uses 10/12/14 rounds as block size increases
IDEA (International Data Encryption Algorithm)
Operates on 64 bit blocks in 8 rounds with 128 bit key
Considered stronger than DES and is used in PGP
Blowfish
64 bit block cipher with up to 448 bit key and 16 rounds
Designed by Bruce Schneier
RC4
Stream cipher with variable key size created by Ron Rivest
RC5
Another Rivest cipher
Block cipher with 32/64/128 bit blocks and keys up to 2048 bits
RC6
Beefier version of RC5 submitted as AES candidate
CAST
64 bit block cipher with keys between 40-128 bits with 12-16 rounds depending on key length
CAST-256 used 128-bit blocks and keys from 128-256 bits using 48 rounds
SAFER (Secure and Fast Encryption Routine)
Set of patent-free algorithms in 64 and 128 bit block variants
Variation used in Bluetooth
Twofish
Adapted version of Blowfish with 128 bit blocks, 128-256 bit keys and 16 rounds
AES Finalist
Kryptografie mit symmetrischem Schlüssel
symmetric key cryptography
symmetric key cryptography tutorial
symmetric key cryptography example
symmetric key cryptography vs asymmetric key cryptography
symmetric and asymmetric key cryptography
symmetric key cryptography
Kryptografie mit symmetrischem Schlüssel
Kryptographie mit symmetrischem Schlüssel
Kryptographie mit symmetrischem Schlüssel
Kryptografie mit symmetrischem Schlüssel und asymmetrische Schlüsselkryptographie
symmetrische und asymmetrische Schlüsselkryptographie
Kryptografie mit symmetrischem Schlüssel

Views: 39852
Zariga Tongy

شرح كامل لطريقة عمل المفتاح لشيفرة DES
- سيف بدران
Information Security and Privacy - DES (Data Encryption Standard) Block Cipher Key Creation / Generation Explained with Example.
Fiestel Structure Ciphers - Block Ciphers - DES
Done By: Saif Badran
http://www.facebook.com/saif.badran
iTeam Academic Group - JU

Views: 65326
iAcademy

A small example of using the RSA algorithm to encrypt and decrypt a message.

Views: 14243
David Metzler

PlayFair Cipher in Hindi – Complete Algorithm with Example
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Control System Complete Lectures - https://www.youtube.com/playlist?list=PLV8vIYTIdSnbvRNepz74GGafF-777qYw4

Views: 66869
Easy Engineering Classes

Both Symmetric and Asymmetric key method can be used to secure message. First the message is encrypted with a symmetric key and then before sending the key to other party the key itself is encrypted with other parties public key. The other party on receiving the encrypted message and encrypted key, first decrypts the key with private key and than decrypts the message by using the decrypted key.
To know more about Java security read http://www.java-redefined.com/2013/08/java-security.html

Views: 605
Java Developer

Java tutorial on how to encrypt and decrypt files using DES algorithm implementation in Java programming language

Views: 6134
Zoran Davidović

SYMMETRIC KEY CRYPTOGRAPHY VS ASYMMETRIC KEY CRYPTOGRAPHY

Views: 56
MCA PLUS

In this tutorial, we will learn Encryption/Decryption for AES CBC mode using PyCrypto. All links for source code, text based tutorial and further reading material will be in the description below.
Detailed Text Based Tutorial
http://www.letscodepro.com/encryption-in-python-using-pycrypto/
Gihub Source Code Link
https://github.com/the-javapocalypse/Python-File-Encryptor
Further Reading Material
http://searchsecurity.techtarget.com/definition/cipher
https://defuse.ca/cbcmodeiv.htm
https://www.di-mgt.com.au/cryptopad.html
http://www.cryptofails.com/post/70059609995/crypto-noobs-1-initialization-vectors
Please Subscribe! And like. And comment. That's what keeps me going.
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Views: 12571
Javapocalypse

In this video you will learn how does encryption and decryption works when you communicate with your friends online and does it maintains privacy to your conversation from the hackers and also you will enjoy it if you have your little interest in cyber security.

Views: 1256
Innovate Yourself

Hill Cipher in Hindi – Complete Algorithm with Example
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Views: 62027
Easy Engineering Classes

Download Code:
https://www.dropbox.com/s/7wzs7g0c51jcb84/symmetric%20Encryption.cpp?dl=0
In this video you will learn,
How to code symmetric Encryption and Decryption Program with C++.
1. all you need to have a compiler in my case i'm using DevC++.
2. on each change you must compile the whole program before execute it.
3. Don't forget to subscribe to my channel.
for any question post comment or email me:
[email protected]

Views: 742
Khaliq Izrail Haxor

Demo of Encrypting and Decrypting of properties at spring cloud config server and Decryption at spring cloud config client

Views: 3623
priya k

This video explains you how to encrypt and decrypt an image using Java. You can also encrypt any file using this format...!
Project Link: https://www.dropbox.com/s/gk51444iadh0edz/Cryptography.rar?dl=0

Views: 33564
Thamizh arasaN

In this vid we'll fill out the bodies to three of the steps in AES. These three steps are AddRoundKey, SubBytes and ShiftRows. The remaining steps to AES are rather fiddly, MixColumns and ExpandKey, so we'll look at those separately.
I've also taken the opportunity to introduce Galois fields for the AddRoundKey section. AddRoundKey is really just a matter of performing XOR, but it helps to understand Galois fields before we come to the MixColumns step.
Link to the S_Box on Wikipedia:
https://en.wikipedia.org/wiki/Rijndael_S-box
Link to the Finite Field/Galois Field Wikipedia page:
https://en.wikipedia.org/wiki/Finite_field
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What's a Creel?

In this video it is easily explained how to find mode
And formulaes of rsa
As well as diffie-hellman
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