Am 19.11.18 um 22:05 schrieb Robert Girault:
Chris Angelico <ros...@gmail.com> writes:
On Tue, Nov 20, 2018 at 7:31 AM Robert Girault <r...@dev.null> wrote:
Nice. So Python's random.random() does indeed use mt19937. Since it's
been broken for years, why isn't it replaced by something newer like
ChaCha20? Is it due to backward compatibility? That would make sense.
What exactly do you mean by "broken"?
I mean the fact that with 624 samples from the generator, you can
determine the rest of the sequence completely.
As far as I understand it, this is true only if you see the full 32bit
output number from the Mersenne Twister for those 624 outputs. If
however you create a list:
[random.randrange(10) for i in range(624)]
I don't think you can predict what follows.
Christian
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