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Re: DES-XEX3 was: A little social engineering

To: wsimpson@greendragon.com (William Allen Simpson)
Subject: Re: DES-XEX3 was: A little social engineering
From: Uri Blumenthal <uri@watson.ibm.com>
Date: Fri, 20 Jun 1997 18:12:03 -0400 (EDT)
Cc: ipsec@tis.com
In-Reply-To: <6058.wsimpson@greendragon.com> from "William Allen Simpson" at Jun 20, 97 08:03:13 pm
Reply-To: uri@watson.ibm.com
Sender: owner-ipsec@ex.tis.com

William Allen Simpson says:
> My memory (from Schneier, Byte, and CryptoBytes) is that this extends
> the DES 56-bits key strength up to about 120-bits for brute-force, and
> boosts the chosen plaintexts from 2**47 to 2**60 for differential.

If *my* memory serves me, DESX increases the key length against brute
force, but has no effect wrt. differential or linear attack.
-- 
Regards,
Uri		uri@watson.ibm.com
-=-=-=-=-=-=-
<Disclaimer>

Follow-Ups:

Re: DES-XEX3 was: A little social engineering

From: "Perry E. Metzger" <perry@piermont.com>

References:

DES-XEX3 was: A little social engineering

From: "William Allen Simpson" <wsimpson@greendragon.com>

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