On Wed, 5 Aug 1998 mgraffam@mhv.net wrote: [...]
The noise coming off of the sound card is more beige than white though..
Does anyone know of any papers, articles or whatever on good techniques to remove bias from the audio source?
See the RFC 1750, Randomness Recommendations for Security. D. Eastlake, 3rd, S. Crocker & J. Schiller. December 1994. (Format: TXT=73842 bytes) A sample from the table of contents gives: [...] 5. Hardware for Randomness............................... 10 5.1 Volume Required...................................... 10 5.2 Sensitivity to Skew.................................. 10 5.2.1 Using Stream Parity to De-Skew..................... 11 5.2.2 Using Transition Mappings to De-Skew............... 12 5.2.3 Using FFT to De-Skew............................... 13 5.2.4 Using Compression to De-Skew....................... 13 5.3 Existing Hardware Can Be Used For Randomness......... 14 5.3.1 Using Existing Sound/Video Input................... 14 5.3.2 Using Existing Disk Drives......................... 14 6. Recommended Non-Hardware Strategy..................... 14 6.1 Mixing Functions..................................... 15 6.1.1 A Trivial Mixing Function.......................... 15 6.1.2 Stronger Mixing Functions.......................... 16 6.1.3 Diff-Hellman as a Mixing Function.................. 17 6.1.4 Using a Mixing Function to Stretch Random Bits..... 17 6.1.5 Other Factors in Choosing a Mixing Function........ 18 6.2 Non-Hardware Sources of Randomness................... 19 6.3 Cryptographically Strong Sequences................... 19 [...] Berke Durak - berke@gsu.linux.org.tr - http://gsu.linux.org.tr/kripto-tr/ PGP bits/keyID: 2047/F203A409 fingerprint: 44780515D0DC5FF1:BBE6C2EE0D1F56A1