The latest version of NOISE.SYS (0.4.9) should be available "real soon now" at ftp.elf.stuba.sk in the ??/security directory [I don't remember the exact path...]. It should also be available at the ftp.wimsey.com and ftp.funet.fi sites soon. NOISE.SYS is a /dev/random driver for DOS systems, similar to the random.c implementation for Linux and FreeBSD. It sets up two devices, "random" and "urandom" which return streams of crypto- quality random bytes based on fast timings from the keyboard IRQ, disk access, Windows 3.x message broadcasts, mouse movement, and cpu clock drift, with some experimental kluges to sample the audio card input [to be improved in future versions]. The raw samples are mixed using a polynomial function and then hashed using SHA-1. Entropy estimation is based on arithmetic coding schemes and how often samples recur, rather than on the sample deltas themselves. The source is included (in 386 assembler) and is relatively easy to modify and experiment with [plenty of comments and macros]. Rob. --- Send a blank message with the subject "send pgp-key" (not in quotes) to <WlkngOwl@unix.asb.com> for a copy of my PGP key.