**Cryptography Tutorials - Herong's Tutorial Examples** - v5.40, by Dr. Herong Yang

Cipher - Public Key Encryption and Decryption

This chapter provides tutorial notes and example codes on the cipher process. Topics include the cipher class, javax.crypto.Cipher; the cipher sample program and test results with DSA and RSA encryption algorithms.

javax.crypto.Cipher - The Public Key Encryption Class

JcePublicCipher.java - Public Key Encryption Sample Program

Conclusions:

- Pairs of public keys and private keys are used for asymmetric encryption algorithms like DSA or RSA.
- The javax.crypto.Cipher class can be used to perform encryption or decryption with pairs of public keys and private keys.

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"