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Re: rpc xid randomness
From: Jun-ichiro itojun Hagino (itojunitojun.org)
Date: Mon Sep 08 2003 - 16:10:44 CDT
> It looks as though the value is calculated from:
> a ** b mod c
> where 'a' changes for each block of numbers, 'b' sequences through
> terms of a LCG whenever a value is wanted (missing 0 to 7 each time)
> and 'c' is constant.
> Some notes I have on the security of RSA (where 'a' would be the message
> and 'b' and 'c' the key) say that you should not use different values of
> 'b' with the same 'c' - otherwise recovering the key is trivial if the
> same message (ie 'a') is encypted with both.
> This use of the equation seems to be going out of its way to make it easy
> to break!
we're not encrypting stuff, we're just trying to generate non-repeating
random number. so i beg to differ.