Xiangrong Fang wrote on Fri, 14 Aug 2015:
I need to generate random numbers to be used as IV of block ciphers. My question is: is FPC built-in PRNG good enough as comparing to /dev/urandom?
No PRNG is suited for that purpose, because every PRNG is by definition predictable and you need unpredictable numbers for IVs.
On the other hand, /dev/urandom in my impression is fairly slow, how is the speed of Random() comparing to that?
They are not comparable, they serve completely different purposes. Additionally, the speed of /dev/urandom depends on a lot of factors (it gets its input from various kinds of activity on the system, so the more activity there is, the faster it becomes).
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