W dniu 19.03.2021 o 12:59, Paul Gilmartin pisze:
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.
Didn't you get B37 abend on /dev/null dataset?
;-)
--
Radoslaw Skorupka
(looking for new job)
Lodz, Poland
----------------------------------------------------------------------
For IBM-MAIN subscribe / signoff / archive access instructions,
send email to [email protected] with the message: INFO IBM-MAIN
