Пишут, что в никс берут случайные значения с микросхемы



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The hw_random framework is software that makes use of a
special hardware feature on your CPU or motherboard,
a Random Number Generator (RNG)
. The software has two parts:
a core providing the /dev/hw_random character device and its
sysfs support, plus a hardware-specific driver that plugs
into that core.

To make the most effective use of these mechanisms, you
should download the support software as well. Download the
latest version of the «rng-tools» package from the
hw_random driver's official Web site:

http://sourceforge.net/projects/gkernel/

Those tools use /dev/hw_random to fill the kernel entropy pool,
which is used internally and exported by the /dev/urandom and
/dev/random special files.