Am 17.06.2015 um 05:06 schrieb cee1:
2015-06-16 0:21 GMT+08:00 Lennart Poettering <lenn...@poettering.net>:On Mon, 15.06.15 23:33, cee1 (fykc...@gmail.com) wrote:Hi,I maybe got confused. First, systemd-random-seed.service will save a "seed" from /dev/urandom when shutdown, and load that "seed" to /dev/urandom when next boot up. My questions are: 1. Can we not save a seed, but load a seed that is read from ** /dev/random ** to ** /dev/urandom **?The seed is used for both. Then you'd feed the stuff you got from the RNG back into the RNG which is a pointless excercise.systemd-random-seed.service will load the "seed on disk" to /dev/urandom, and save a "seed" to disk when shutdown, right? The article at http://www.2uo.de/myths-about-urandom/ suggests us saving the seed as soon as there is enough entropy(means read from /dev/random? if returns, there's enough entropy),
well, so you read the seed and inject it to /dev/random followed by read /dev/random and overwrite the seed for the next boot - don't sounds that good
Saving the seed early, make it more tolerant against the case of system crashes - that means not shutdown properly(which maybe the case on some mobile device such as STB
if a system don't shut down properly all the time fix that problem
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