[24607] in Cypherpunks
Re: Pentium FDIV
daemon@ATHENA.MIT.EDU (Paul Robichaux)
Thu Dec 29 12:19:29 1994
From: paul@poboy.b17c.ingr.com (Paul Robichaux)
To: bshantz@spry.com
Date: Thu, 29 Dec 94 11:10:45 CST
Cc: cypherpunks@toad.com
Reply-To: perobich@ingr.com
In-Reply-To: <199412291643.IAA25785@homer.spry.com>; from "bshantz@spry.com" at Dec 29, 94 8:43 am
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> Haven't seen too much discussion of this and how it would affect crypto in
> general. Would the FDIV problem cause any problems when looking at large
> prime numbers? Actually, let me rephrase that, would it affect determining
> if a large number is prime? Floating point errors can be so much fun.
I don't know how you missed it; it was certainly here. Let me summarize:
- crypto typically uses integers
- RSA crypto uses large integers
- the Pentium FDIV bug only affects floats
- -Paul
- --
Paul Robichaux, KD4JZG | Good software engineering doesn't reduce the
perobich@ingr.com | amount of work you put into a product; it just
Not speaking for Intergraph. | redistributes it differently.
### http://www.intergraph.com ###
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