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Re: 3DES keys

To: "William Allen Simpson" <bsimpson@morningstar.com>
Subject: Re: 3DES keys
From: "Perry E. Metzger" <perry@piermont.com>
Date: Mon, 02 Oct 1995 21:41:06 -0400
Cc: ipsec@ans.net
In-Reply-To: Your message of "Mon, 02 Oct 1995 04:42:11 GMT." <199510020505.AA26294@interlock.ans.net>
Reply-To: perry@piermont.com

"William Allen Simpson" writes:
> Could someone post the location of the paper or argument which says that
> 3DES with 2 keys is no better than DES?  Are 3 keys any better?  What is
> the current analysis?

Two n bit keys in multiple encryption schemes give you somewhat less
than an effective 2n key bit key length, whereas three keys actually
give you an effective 2n bit key length. See the discussion in
Schneier's book on crypto -- I think its in chapter 8.

Perry

References:

Re: 3DES keys

From: "William Allen Simpson" <bsimpson@morningstar.com>

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