On 4/15/15, The Doctor <[email protected]> wrote: > ... > I've gotten some success with a USB enabled Geiger counter > (https://www.sparkfun.com/products/11345). A little Python was used > to open the USB serial device and measure the amount of time that > passed in between characters being emitted, hash them, and cat the > hashes into /dev/random to give the kernel pool a little more to work > with. The unit's pretty large (larger than the RasPi) and needs a > housing of some kind to really protect it. I wouldn't use it for an > HSM but for experimenting at home it works decently well.
the Pi has built-in camera capability; see the other threads about LEDs into a CCD for stochastic measurement at high rates. as amusing as ionizing radiation may be for entropy generation, there are much more practical routes :P > Now I just > need to get around to learning SciPy to profile the output of > /dev/urandom for biases... DIHARDER over gigs will give you a great gist. is there a specific type of (transient) bias you're after?
