Install Java Cryptography Extension (JCE) Unlimited Strength Jurisdiction Policy Files 6

• Step one :
  Download required files from hear. This two file are not shifted with standalone jre download. Hear you will get two file namely :
  • local_policy.jar
  • US_export_policy.jar
• Step Tow :
  Find jre installation directory in your windows/linux machine .
  And locate the path

  C:\Program Files\Java\jre6\lib\security  
  //[in case of my windows 7 machine]

  
  
• Step Three :
  Just past downloaded two files in located directory and overwrite previous two.

This will facilitate AES key generation up to 256 bits.

Example :

keyGenerator = KeyGenerator.getInstance("AES");
keyGenerator.init(256);

For enthusiastic readers further reference on Java Security