A thought on 40-bit DES keys

To: cat-ietf at MIT.EDU
Subject: A thought on 40-bit DES keys
From: John Gardiner Myers <jgmyers at netscape.com>
Date: Tue, 21 Apr 1998 23:17:22 -0700
Delivery-date: Wed, 22 Apr 1998 03:59:21 -0400
Newsgroups: mcom.list.cat-ietf
Organization: Netscape Communications Corporation

A thought occured to me that draft-hoffman-des40 may be useful in an IETF
standard.  It may be a good idea to revise the Kerberos V5 specification to
state that keys conforming to draft-hoffman-des40 MUST NOT be used in the
des-* enctypes, just like keys which are "weak" or "semiweak" per the DES
specification shall not be used.

That way, a host with a policy of using 56 bits will not be fooled into
communicating with an implementation with an incompatible policy.

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A thought on 40-bit DES keys

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