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Re: Flaw in commonly used bash random seed method
From: Dave English (dave.englishthus.net)
Date: Tue Apr 04 2006 - 03:21:40 CDT
>By the way, if the random function can only generate numbers between 0
>and 32767, won't 2 bytes be enough then? The algorithm will perform a
>modulo calculation anyway, so 4 bytes won't really add anything. Of
>course, it is much better then only one byte.
That will depend on whether the state stored between calls to the PRNG
is only 15-bits, or something larger.
If more state is stored than is enumerated in the result, then the
generator should have more points on its sequence than 32768 . In that
case then, seeding with more than 15 bits would be worthwhile.
I have not looked at Bash myself, to see what it actually does
Dave English Senior Software & Systems Engineer
Internet Platform Development, Thus plc
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