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We need to generate a lot of random bytes. It is a good idea to perform
some other action (type on the keyboard, move the mouse, utilize the
disks) during the prime generation; this gives the random number
generator a better chance to gain enough entropy.
++++++++++++++++++++++++++++++++++++++++..+++++.+++++++++++++++.+
+++++++++.+++++++++++++++++++++++++++++++++++.+++++++++++++++++++
++++++>++++++++++................................................
............+++++

Not enough random bytes available.  Please do some other work to give
the OS a chance to collect more entropy! (Need 300 more bytes)

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 cat /proc/sys/kernel/random/entropy_avail
28

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EGD: The Entropy Gathering Daemon

EGD is an Entropy Gathering Daemon meant to be used on systems that can run GPG but which don't have this convenient source of random bits. It is a regular user-space program that sits around, running programs like 'w' and 'last' and 'vmstat', collecting the randomness (or at least the unpredictability) inherent in the output of these system statistics programs when used on a reasonably busy system. It slowly stirs the output of these gathering programs into a pool of entropy, much like the linux kernel device, and allows other programs to read out random bits from this pool.

Quelle & Download : http://egd.sourceforge.net/

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/dev/random

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/dev/urandom