• Subject: Re: AS/400 entropy source
  • From: "Leif Svalgaard" <leif@xxxxxxxx>
  • Date: Wed, 29 Nov 2000 20:59:08 -0600

From: Tim McCarthy <timm@as400ftp.com>
 >  > xor-ing various parts of a Universal Unique Identifier (UUID) would seem
to
 >  > a measured and sanctioned method as it is guaranteed that this 128 bit
 >  > value will be globally unique.
 > [Tim McCarthy]  But if it's guaranteed to be globally unique
 > then it must be predictable and therefore unsuitable.
My point was that it is irreproducible. folding it over twice with xor's to
produce
a 32-bit value further helps to randomize the bits. run the result though a
DES
encryption with the current time as the key. The irreproducibility is the
important
point. 

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