DES Operation Modes in JCE

This section describes what DES operation modes are implemented in the JDK JCE package, and how to use them.

Sun has implemented all 4 operation modes described above in their JDK JCE (Java Cryptography Extension) package. To use DES operation modes properly, you need to:

1. Specify the operation mode name as part of the algorithm name when calling Cipher.getInstance(algorithm) to create a cipher object like:

   Cipher cObj1 = Cipher.getInstance("DES/ECB/NoPadding");
   Cipher cObj2 = Cipher.getInstance("DES/CBC/NoPadding");
   Cipher cObj3 = Cipher.getInstance("DES/CFB/NoPadding");
   Cipher cObj4 = Cipher.getInstance("DES/OFB/NoPadding");

2. Initialize the cipher object with the key and the IV (Initial Vector) by using the IvParameterSpec class like:

   AlgorithmParameterSpec apsObj = new IvParameterSpec(theIV);
   cObj.init(Cipher.ENCRYPT_MODE, keyObj, apsObj);

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 Encryption Operation Mode Introduction

 What is ECB (Electronic CodeBook) Operation Mode?

 What is CBC (Cipher Block Chaining) Operation Mode?

 What is CFB (Cipher FeedBack) Operation Mode?

 What is OFB (Output FeedBack) Operation Mode?

DES Operation Modes in JCE

 JCE DES Operation Mode Testing Program

 JCE DES Operation Mode Testing Program Result

 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

 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