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Subject: Re: Random keys and hamming distance

Author: Dieter Buerssner

Date: 14:18:19 08/17/02

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On August 17, 2002 at 17:01:17, Will Singleton wrote:

>Did you test for randomness also?  In my tests, combining 2 32-bit ints results
>in a pretty severe bunching of numbers.  I did a graphical look at all the
>generated numbers (just stuck them on Excel), and the difference was startling.

What was the difference you saw? Could you give me an "algorithm" to see the
difference? Which 32-bit pseudo random number generator (PRNG) did you use, and
which 64 bit PRNG, where you saw that difference? I hope, my questions don't
sound provocative - I am really interested.

Perhaps some contributors to this thread may find
http://stat.fsu.edu/~geo/diehard.html interesting. There are a lot of tests for
the "randomness" of PRNGs, and it is pretty easy to try out your own favorite
PRNG with those tests. However, interpreting the results may need some
statistical knowledge.

Regards,
Dieter



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