On Fri, 19 Mar 2021 14:43:05 +0800, Timothy Sipples wrote: > ... >Paul Gilmartin wrote: >>The latter suggests that a pseudo RNG is periodically reseeded >>by the TRNG > >Yes, that's right. CPACF on the IBM z14 and LinuxONE II models, and >higher, have this feature. If you try to use the TRNG for every random >number request it's really slow, but fortunately that's not required to >achieve the desired, certified outcome. Seeding is rather important, >though, and that's why they're there. > Thanks. UNIX has long had /dev/random, a TRNG (subject to hardware availability) and /dev/urandom, a seeded PRNG.
For a while I had a Solaris tower under my desk. The perceptible difference was that "cat /dev/random >/dev/null" caused the fan to speed up audibly; "cat /dev/urandom >/dev/null" was silent. And: https://en.wikipedia.org/wiki/Lavarand -- gil ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
