[cryptography] [liberationtech] Random number generation being influenced - rumors

James A. Donald jamesd at echeque.com
Mon Sep 9 08:12:30 EDT 2013

On 2013-09-09 3:18 PM, Greg Rose wrote:
> I actually hate to point this out, but having access to something that 
> "looks like" a raw entropy source proves nothing.

A genuine hardware noise source will show colored noise, which is very 
hard to simulate in software, and especially hard to simulate at any 
reasonable speed.

If the entropy source is real, it will show its analog characteristics 
leaking into the digital abstraction. The correlations and anti 
correlations between nearby bits will reflect the analog values of the 
circuit, thus no two chips will show quite the same correlations, and 
the correlations will vary with temperature and overclocking. These 
analog variations would be compelling evidence that the entropy source 
is the claimed circuit or something very like the claimed circuit.

Any Intel misconduct would show up in the color of the noise, it being 
very hard to create a digital pseudo noise source that displays subtly 
varying color at high speed, while hardware true random noise sources 
almost unavoidably display subtly varying noise color.)

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