> David Laight <david@l8s.co.uk> writes:
> > - sequences where values are guaranteed not to be reproduced
> > - random values
> 
> One way to do this is encrypting a counter with a 32 bit block cipher,
> but until a few minutes ago I was unaware of any. (Now I've learned of
> one on the cryptography mailing list.)

	we have needs for 16bit and 20bit, do you know of 16/20bit block cipher?

itojun