On 08/26/2010 11:34 PM, Thomas wrote: > Luckily /dev/random is re-seeded during run-time.
I would have said something different: *IF* you are lucky, then /dev/random gets reseeded during run time. > So even if you do > a roll-back of a system and the new input it non-deterministic it will > generate different output immediately. Depending on details of the system, there is no guarantee that /dev/random gets reseeded at all, much less reseeded "immediately". There exist lots of small and/or embedded and/or virtual Linux systems that have no useful sources of entropy. The kernel attempts to collect entropy, but there are no positive lower bounds on the effectiveness of the built-in measures. You could always add a source, but that is a topic for a whole new discussion. For more on this, see http://www.av8n.com/turbid/ --------------------------------------------------------------------- The Cryptography Mailing List Unsubscribe by sending "unsubscribe cryptography" to majord...@metzdowd.com