On Thursday, March 14, 2019 at 5:13:51 PM UTC-5, Jaime Hablutzel wrote: > > 64bits_entropy = GetRandom64Bits() //This returns 64 random bits from a > > CSPRNG with at least one bit in the highest byte set to 1 > > > > is, strictly speaking, not true. The best possible implementation for > > GetRandom64Bits(), as described, only returns 63.994353 bits of entropy, > > not 64. > > > > Can you share how did you get the previous 63.994353?. > > I'm trying the following and I'm getting a different value: > > a = 2^64 = 18446744073709551616 > b = 0x80000000000000 = 36028797018963968 > > (a - b) / a * 64 = 63.875 > > Maybe I'm misunderstanding something.
Maths were wrong, sorry. I got your same calculation: min = 0100000000000000 = 72057594037927936 max = 00FFFFFFFFFFFFFFFF = 18446744073709551615 log2(max - min + 1) = 63.99435343685886 _______________________________________________ dev-security-policy mailing list [email protected] https://lists.mozilla.org/listinfo/dev-security-policy
