You'll need the following items to complete the programming exercises in this tutorial:

• JDK 1.4, Standard Edition
  
  
• The tutorial source code and classes, JavaSecurity1-source.jar, so that you can follow the examples as we go along
  
  
• The Bouncy Castle Crypto library for the RSA example
  
  
• A browser that supports the Java 1.4 plug-in

You can use JDK 1.3.x, but you must install JCE and JSSE yourself.