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The following archive was created by hippie-mail 7.98617-22 on Fri Aug 21 1998 - 17:20:48 ADT
Bob Baldwin (baldwin@rsa.com)
Mon, 20 Jul 1998 12:20:04 -0700
On Mon, 20 Jul 1998 14:45:22-0400, Perry E. Metzger wrote:
>DES has been routinely used in weird new modes, and IBM never
>attempted to enforce the patent on it under any circumstances.
>They accepted that DES was no longer something they should
>expect to profit from.
Actually, IBM has enforced its patents for digest functions
based on DES (or any other block cipher) called MDC-2
and MDC-4. It also has a patent on using DES to create
a 40-bit keyspace version called CDMF. Both of these
"weird new modes" for DES are patented and IBM does in
fact enforce them.
--Bob Baldwin
RSA Data Security
The following archive was created by hippie-mail 7.98617-22 on Fri Aug 21 1998 - 17:20:48 ADT