It&#x27;s definitely based on my approach, but it&#x27;s missing the concept a bit.  The only way this approach gets entropy is if you cross two clocks at very different speeds, and get randomness from the mismatched tolerances.  For example, using a computer&#x27;s microsecond accurate clock to measure a human&#x27;s 100 millisecond scale behavior yields bits, because we can&#x27;t be microsecond accurate even if we try.<p>The bitflipping I was exploring involved matching the CPU clock (nanosecond scale) with the real time clock (millisecond scale).  This of course has some risk because the OS can easily implement the latter with the former.  And in fact, in this implementation, that&#x27;s actually what happens -- he&#x27;s measuring the number of bit flips at nanosecond accuracy.  Output is distinguishable from PRNG, as seen elsewhere.<p>If I remember right somebody did break my &quot;Defcon Challenge&quot; with Firefox.