On 25/09/06, Howard Winter wrote: > Surely what you actually need is something that is unpredictable without some known value, and such known value must be infeasible (impossible?) > to determine solely from the encrypted data? That would be, for example, RC4. You could of course just use it for a random number generator... -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist