Re: Re: Improving mt_rand() seed

On 2017-01-17 16:18, Lauri Kenttä wrote:

On 2017-01-17 02:34, Yasuo Ohgaki wrote:

Set state somewhere between MT rand's 2^19937−1 cycle.

This is exactly what my patch does.

Or, to be honest, my patch provides 2^19936 possible states, which should be more than enough. To get all 2^19937−1, you would need to get one more bit of entropy (2^19936 to 2^19937) and then check that the state is not all zeros (which is the −1 in 2^19937−1). That's certainly not worth the trouble, so I just set that one "extra" bit to 1. (MT doesn't work if the state is all zeros.) -- Lauri Kenttä