Private and Public Keys and Related Interfaces

This section describes private and public key pairs used in RSA and DSA encryption algorithms. JDK supports private and public keys with the java.security.Key interface.

What a private and public key pair? A private and public key pair is a private key and a public key used in a public key encryption algorithm.

Known private and public key pair generation algorithms are:

JDK supports private and pubic key pairs with 3 interfaces.

1. java.security.Key is the interface acting as a base to support common features of both private key and public key. Major methods include:

getAlgorithm() - Returns the algorithm name used to generate the key.

getEncoded() - Returns the key as a byte array in its primary encoding format, or null if this key does not support encoding.

getFormat() - Returns the name of the primary encoding format of this key, or null if this key does not support encoding.

2. java.security.PrivateKey is the interface representing a private key. It extends java.security.Key interface with no additional methods.

3. java.security.PublicKey is the interface representing a public key. It extends java.security.Key interface with no additional methods.

Last update: 2013.

Table of Contents

 About This Book

 Cryptography Terminology

 Cryptography Basic Concepts

 Introduction to AES (Advanced Encryption Standard)

 Introduction to DES Algorithm

 DES Algorithm - Illustrated with Java Programs

 DES Algorithm Java Implementation

 DES Algorithm - Java Implementation in JDK JCE

 DES Encryption Operation Modes

 DES in Stream Cipher Modes

 PHP Implementation of DES - mcrypt

 Blowfish - 8-Byte Block Cipher

 Secret Key Generation and Management

 Cipher - Secret Key Encryption and Decryption

 Introduction of RSA Algorithm

 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

Private and Public Keys and Related Interfaces

 KeyPair and KeyPairGenerator Classes

 Key Pair Sample Program - JcaKeyPair.java

 DSA Private Key and Public Key Pair Sample

 RSA Private Key and Public Key Pair Sample

 DiffieHellman Private Key and Public Key Pair Sample

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

 Cipher - Public Key Encryption and Decryption

 MD5 Mesasge Digest Algorithm

 SHA1 Mesasge Digest Algorithm

 OpenSSL Introduction and Installation

 OpenSSL Generating and Managing RSA Keys

 OpenSSL Managing Certificates

 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"

 Using Certificates in IE (Internet Explorer)

 Using Certificates in Firefox

 Using Certificates in Google Chrome

 Outdated Tutorials

 References

 PDF Printing Version