How to crack Java’s default random number generator, java.util.Random

“You should be aware that while Random() is usually uniformly distributed, Random()Random() is not. And so is Random()+Random().” - Belisarius Nice illustration of Central Limit theorem.

The purpose of this note is to illustrate how the ordinary standards of ran- domness have little to do with the type of randomness required for cryptographic purposes. That is, there are really two standards of randomness.