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From: baum@apple.UUCP (Allen J. Baum)
Newsgroups: sci.crypt
Subject: Re: Design for a DES-breaker
Message-ID: <6491@apple.UUCP>
Date: Fri, 16-Oct-87 17:48:46 EDT
Article-I.D.: apple.6491
Posted: Fri Oct 16 17:48:46 1987
Date-Received: Sun, 18-Oct-87 02:33:49 EDT
References: <7449@reed.UUCP-> <1409@osiris.UUCP> <289@apr.UUCP> <17195@glacier.STANFORD.EDU> <1477@faline.bellcore.com>
Reply-To: baum@apple.UUCP (Allen Baum)
Organization: Apple Computer, Inc.
Lines: 15

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>I do not know how much chip real estate a DES engine takes, but John's
>figures seem a tad optimistic when compared to existing technology.
>

>Pipelining the DES engine would clearly increase its area at least 16
>times, since not only do you need 16 copies of the S and P boxes but
>also 16 key registers...

I'm not sure that this is true. What happens at each stage is a permutation
and an xor. If each stage doesn't have to share the permutation logic, then
its simply wires, not lots of wires + a 16 way mux

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