Messages in this thread |  | | From | Stephan Mueller <> | Subject | Re: [PATCH] CPU Jitter RNG: inclusion into kernel crypto API and /dev/random | Date | Wed, 06 Nov 2013 12:42:47 +0100 |
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Am Dienstag, 5. November 2013, 14:45:58 schrieb Stephan Mueller:
Hi Pavel,
>Am Dienstag, 5. November 2013, 13:25:40 schrieb Stephan Mueller: > >Hi Pavel, > >>Am Montag, 4. November 2013, 00:32:07 schrieb Pavel Machek: >>>But they usually _do_ have RTC or other clock, not driven by CPU >>>oscilator. Good. >>> >>>What about just >>> >>>while (!enough_entropy) { >>> >>> cur_time = read_rtc(); >>> simulated_tsc = 0; >>> while (cur_time == read_rtc()) >>> >>> simulated_tsc++; >>> >>> gain_entropy_from(simulated_tsc) >>> >>>} >> >>That is an interesting piece of code -- what would you do in the >>gain_entropy_from function? > >Please disregard my question. > >I plugged that idea into my current Jitter RNG processing and disabled >the other jitter measurements to get a clear, isolated picture. > >The result is also a white noise! And it is even quite fast.
After doing some more research on this approach, I have to admit that the output not good (i.e. white noise) in all situations. Therefore, I dropped that (for now).
But thank you very much for your suggestion.
Ciao Stephan
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