Messages in this thread | | | Date | Fri, 01 Feb 2002 17:50:05 -0800 | From | "H. Peter Anvin" <> | Subject | Re: Continuing /dev/random problems with 2.4 |
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Peter Monta wrote:
>>The point with the tests that have been mentioned is to derive such a >>conservative estimate, and to raise a red flag if the output suddenly >>becomes predictable. >> > > Ah, I see; I was misled by the "truly random" remark, sorry. So a reasonable > sanity test for a block of audio samples might be a standard deviation > greater than a few LSB; this will catch constant or close-to-constant > output. >
However, those aren't the main failure modes you need to be concerned with. Antenna effects may actually be your biggest problem -- picking up deterministic signals from other parts of the system.
However, I believe this is a solved problem. It would definitely be interesting taking rngd and figuring out a way to drive it from /dev/dsp -- probably not too difficult a modification.
-hpa
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