**Cryptography Tutorials - Herong's Tutorial Examples** - Version 5.40, by Dr. Herong Yang

Introduction to AES (Advanced Encryption Standard)

Tutorial notes and example codes on AES algorithms. Topics include introduction of AES (Advanced Encryption Standard); AES encryption algorithm; AES key schedule (round keys) algorithm and illustration example; MixColumns procedure algorithm; AES decryption algorithms.

What Is AES (Advanced Encryption Standard)?

AES, or Rijndael, Encryption Algorithm

AES MixColumns() Procedure Algorithm

Example Vector of AES Encryption

Conclusions:

- AES (Advanced Encryption Standard) is the data encryption standard adopted in 2001 by the US government to replace DES (Advanced Encryption Standard).
- AES uses Rijndael ciphers developed by Joan Daemen and Vincent Rijmen.
- AES ciphers are symmetric 128-bit block encryptions with 128-bit, 196-bit and 256-bit keys.
- AES ciphers are more secure and faster than DES ciphers.

Table of Contents

►Introduction to AES (Advanced Encryption Standard)

DES Algorithm - Illustrated with Java Programs

DES Algorithm Java Implementation

DES Algorithm - Java Implementation in JDK JCE

DES Encryption Operation Modes

PHP Implementation of DES - mcrypt

Blowfish - 8-Byte Block Cipher

Secret Key Generation and Management

Cipher - Secret Key Encryption and Decryption

RSA Implementation using java.math.BigInteger Class

Introduction of DSA (Digital Signature Algorithm)

Java Default Implementation of DSA

Private key and Public Key Pair Generation

PKCS#8/X.509 Private/Public Encoding Standards

Cipher - Public Key Encryption and Decryption

OpenSSL Introduction and Installation

OpenSSL Generating and Managing RSA Keys

OpenSSL Generating and Signing CSR

OpenSSL Validating Certificate Path

"keytool" and "keystore" from JDK

"OpenSSL" Signing CSR Generated by "keytool"

Migrating Keys from "keystore" to "OpenSSL" Key Files

Certificate X.509 Standard and DER/PEM Formats

Migrating Keys from "OpenSSL" Key Files to "keystore"