> > > I have two embedded boards (one ARM, one PowerPC), running two > > > different versions of 2.6. They have no hard drives, keyboards or > > > mice. They each have a NIC, but I understand these make no > > > contribution to the entropy pool. > > > if [ -f $random_seed ]; then > > > cat $random_seed >/dev/urandom # should seed the pool > > > fi > > > dd if=/dev/urandom of=$random_seed count=1 2>/dev/null # save some > > > data from urandom for next boot > > > I have rebooted my boards many times, and after each boot I read the > > > contents of $random_seed. Whilst it does not happen every time, the > > > contents of $random_seed are /often the same/. To give you a feel: > > > rebooted 11 times, got a total of 3 different outputs. > > > > Ok, so this is telling me a couple of things. First of all, if you're > > only getting three outputs, it means that you don't have any > > peripherals feeding entropy into the system from the boot sequence. > > Without any hard drives, keyboards or mice, and a NIC whose device > > driver hasn't been configured to feed entropy, you're definitely > > hosed. > > Can we get at least time-of-boot from rtc clock to the pool? We really > should not be getting identical outputs...
And add readings from lm-sensors as well? I guess harddisk and cpu temperatures (lower bits) and such are pretty random? Folkert van Heusden -- MultiTail est un flexible tool pour suivre de logfiles et execution de commandements. Filtrer, pourvoir de couleur, merge, 'diff-view', etc. http://www.vanheusden.com/multitail/ ---------------------------------------------------------------------- Phone: +31-6-41278122, PGP-key: 1F28D8AE, www.vanheusden.com - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
