are there good software tools for testing entropy, that could help
applications determine if the underlying system is giving them good
input?
see also...
http://packages.debian.org/wheezy/rng-tools
Package: rng-tools (2-unofficial-mt.14-1)
Daemon to use a Hardware TRNG
The rngd daemon acts as a bridge between a Hardware TRNG (true random number
generator) such as the ones in some Intel/AMD/VIA chipsets, and the kernel's
PRNG (pseudo-random number generator).
It tests the data received from the TRNG using the FIPS 140-2 (2002-10-10)
tests to verify that it is indeed random, and feeds the random data to the
kernel entropy pool.
This increases the bandwidth of the /dev/random device, from a source that
does not depend on outside activity. It may also improve the quality
(entropy) of the randomness of /dev/random.
A TRNG kernel module such as hw_random, or some other source of true entropy
that is accessible as a device or fifo, is required to use this package.
This is an unofficial version of rng-tools which has been extensively
modified to add multithreading and a lot of new functionality.
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end
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