On 3 Sep 2015, at 19:23, Viktor Dukhovni <openssl-users at dukhovni.org> wrote: > Cat those files into /dev/urandom or /dev/random. That'll mix them > into the system's entropy pool. Then generate keys as usual from > /dev/urandom. I have used a deck of playing cards as a source of entropy, saved to a ram disk on a system with no swap, used then discarded. This has the advantage that you know where the randomness comes from. Regards, Graham --