On 06/19/2012 02:11 PM, coderman wrote:
the sanity checks, being on die, are limited. you can't run DIEHARD against this in a useful manner because the DRBG obscures anything useful.
I don't think there's anything useful diehard (specifically) is going to tell you.
The raw entropy source output would not be expected to pass diehard. The CR report shows visible artifacts in that FFT graph. The entropy estimation function one would apply to that source would likely be much simpler than the diehard suite. Just a sanity check that the output is actually changing once in a while would go a long way towards eliminating the most common failure modes.
On the other hand, the AES CTR DRBG output will always pass diehard, whether it contains any entropy or not.
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