[cryptography] urandom vs random

ianG iang at iang.org
Tue Aug 20 02:08:40 EDT 2013

On 20/08/13 03:46 AM, Peter Gutmann wrote:
> shawn wilson <ag4ve.us at gmail.com> writes:
>> It's not like they're the only ones that sell these, but they /were/ the only
>> ones to sell USB PRNG at <$800.
> You can get them for as little as $50 in the form of USB-key media players
> running Android.  Or if you really insist on doing the whole thing yourself,
> get something like an EA-XPR-003 ($29 in single-unit quantities from Digikey,
> http://www.digikey.com/product-detail/en/EA-XPR-003/EA-XPR-003-ND/2410099) and
> solder on a zener diode and a few I2C environmental sensors for
> noise/unpredictability generation.
> I don't see what the point is though, given that there's more than enough
> noisy data available on a general-purpose PC.

Has anyone done a survey?

On a related point, what name do we give to the design/pattern for

    entropy sources ==> mix/pool ==> deterministic expansion function

?  I was asked this seconds after tasking my intern to build one :-/


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