1993-10-14 - Re: DES
Header Data
From: “Perry E. Metzger” <pmetzger@lehman.com>
To: cypherpunks@toad.com
Message Hash: 7d2b4656b77b08abda53c2496b4245c8ec8bd56cb0ff43f6de460c62632060ca
Message ID: <9310141809.AA11855@snark.lehman.com>
Reply To: <9310141751.AA06344@anon.penet.fi>
UTC Datetime: 1993-10-14 18:11:58 UTC
Raw Date: Thu, 14 Oct 93 11:11:58 PDT
Raw message
From: "Perry E. Metzger" <pmetzger@lehman.com>
Date: Thu, 14 Oct 93 11:11:58 PDT
To: cypherpunks@toad.com
Subject: Re: DES
In-Reply-To: <9310141751.AA06344@anon.penet.fi>
Message-ID: <9310141809.AA11855@snark.lehman.com>
MIME-Version: 1.0
Content-Type: text/plain
wonderer says:
> I don't think it takes the cube of it. There are 56 bits in
> one key, and 112 bits in two keys, so there could not be
> an entropy of more than 112 bits to triple DES. It is no
> more cryptographically secure than double DES because it
> uses 2 keys.
In spite of the "standard" most people do triple DES with three keys.
With the two key system, it would take T^2+T time to do the
calculation, where T is the time to crack single DES on your machine.
Perry
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- 1993-10-14 (Thu, 14 Oct 93 10:51:59 PDT) - Re: DES - an41418@anon.penet.fi (wonderer)
- 1993-10-14 (Thu, 14 Oct 93 11:11:58 PDT) - Re: DES - “Perry E. Metzger” <pmetzger@lehman.com>
- 1993-10-15 (Thu, 14 Oct 93 17:32:04 PDT) - Re: DES - Matthew J Ghio <mg5n+@andrew.cmu.edu>