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Re: Noise source processing
On Wed, 5 Aug 1998 [email protected] 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 - [email protected] - http://gsu.linux.org.tr/kripto-tr/
PGP bits/keyID: 2047/F203A409 fingerprint: 44780515D0DC5FF1:BBE6C2EE0D1F56A1