Over the weekend I hacked up a one-time-pad generator from the random number code I've been writing for Privtool, which uses noise from the audio device to generate random numbers. The code basically reads in a 512-byte block from /dev/audio, then takes the MD5 of that block to generate 16 bytes of the OTP. The raw audio data I'm getting is not particularly random and will compress by 3:1 using gzip or compress, so I'm assuming that using a 32:1 ratio here via MD5 will give a truly random output (it's certainly uncompressible). Before I release the source code to the Net, can anyone give me any good reasons to believe that this won't produce physically random output, or make suggestions on how to test, or improve, the generated output ? There's a #define which can be used to easily increase the amount of data fed into the MD5, but at the moment it will only generate about 1 MB per hour on a Sparcstation (limited by the audio input rate), so I don't want to increase that if I don't have to. Mark