Raspberry pi safe?

Wed Apr 15 11:03:26 PDT 2015

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On 04/15/2015 02:05 AM, Cathal (Phone) wrote:

> Personally I'd draw from several sources to feed /dev/random: an 
> internal hash-chain (quick Python script) (re)seeded on a password
> and urandom periodically, the hardware entropy generator, Ubuntu's
> seed server.. don't trust one source, mash them up once a
> minute/hour and feed them to /dev/random.

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.  Now I just
need to get around to learning SciPy to profile the output of
/dev/urandom for biases...

- -- 
The Doctor [412/724/301/703/415] [ZS]
Developer, Project Byzantium: http://project-byzantium.org/

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