I have seen mentioned in sci.electronics (not recently) that true random number generator chips are available off-the-shelf. Texas Instruments was mentioned as one source, but I don't remember details. -- ____ Richard Kennaway \ _/__ School of Information Systems Internet: [email protected] \X / University of East Anglia uucp: ...mcsun!ukc!uea-sys!jrk \/ Norwich NR4 7TJ, U.K.