1993-09-28 - Re: Phil Zimmerman on ‘The Death of DES’
Header Data
From: cme@ellisun.sw.stratus.com (Carl Ellison)
To: cypherpunks@toad.com
Message Hash: 8deebbf672c3c383161d1325fde50426e336780ef48ebf9af723a6f554a7b5cc
Message ID: <9309282044.AA26047@ellisun.sw.stratus.com>
Reply To: N/A
UTC Datetime: 1993-09-28 20:46:22 UTC
Raw Date: Tue, 28 Sep 93 13:46:22 PDT
Raw message
From: cme@ellisun.sw.stratus.com (Carl Ellison)
Date: Tue, 28 Sep 93 13:46:22 PDT
To: cypherpunks@toad.com
Subject: Re: Phil Zimmerman on 'The Death of DES'
Message-ID: <9309282044.AA26047@ellisun.sw.stratus.com>
MIME-Version: 1.0
Content-Type: text/plain
Single DES is weak, for a known plaintext attack. I think we knew that.
We didn't know how weak.
We can extrapolate to an NSA machine with 1 second scan of all keys,
perhaps.
So --
1. use triple DES
2. before using DES, XOR with a stream from a decent PRNG (destroying
the known plaintext)
3. in between DES operations, mix bytes up as with tran (posted on
sci.crypt occasionally, avbl from me by mail or on ripem.msu.edu)
-- spreading bytes out within a huge block, further hiding any
known text
- Carl
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- 1993-09-28 (Tue, 28 Sep 93 13:46:22 PDT) - Re: Phil Zimmerman on ‘The Death of DES’ - cme@ellisun.sw.stratus.com (Carl Ellison)
- 1993-09-28 (Tue, 28 Sep 93 16:11:35 PDT) - Re: Phil Zimmerman on ‘The Death of DES’ - “Perry E. Metzger” <pmetzger@lehman.com>
- 1993-09-29 (Wed, 29 Sep 93 05:36:23 PDT) - Re: Carl Ellison on ‘The Death of DES’ - m5@vail.tivoli.com (Mike McNally)
- 1993-09-29 (Wed, 29 Sep 93 08:01:51 PDT) - Re: Carl Ellison on ‘The Death of DES’ - Michael Johnson <mpj@csn.org>