random numbers : Java Glossary

random numbers: Any one who considers arithmetical methods of producing random digits is, of course, in a state of sin. For, as has been pointed out several times, there is no such thing as a random number — there are only methods to produce random numbers, and a strict arithmetic procedure of course is not such a method.
~ John von Neumann (born: 1903-12-28 died: 1957-02-08 at age: 53)
There are two kinds of random numbers, pseudo-random numbers that can be rapidly generated from mathematical formulae, and true random numbers, generated from some random physical process such as radioactive decay. Pseudo-random numbers are useless for cryptography. You need true random numbers for that. You now probably want to follow the link to pseudo-random numbers.
Any one who considers arithmetical methods of producing random digits is, of course, in a state of sin. For, as has been pointed out several times, there is no such thing as a random number — there are only methods to produce random numbers, and a strict arithmetic procedure of course is not such a method.
~ John von Neumann (born: 1903-12-28 died: 1957-02-08 at age: 53)

Collections.shuffle will scramble the objects in an ArrayList.

modulus
Orion Random Number Generator
pseudo-random numbers
true random numbers
uncrackable encryption

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