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  3. October 2001

Re: Encryption on the AS/400

From: Goodbar, Loyd (AFS-Water Valley) >. But with last year's
> discussion on IBM's password vulnerabilities, and increased knowledge of
> cryptanalysis, I can't believe that a secret algorithm will protect data.

Loyd, you are quite justified not believing this. Modern cryptography
embraces a principle first expressed in 1883 by Jean-Guillaume-Hubert-
Victor-Francois-Alexandre-Auguste Kerckhoffs von Nieuwenhof, namely
that "compromize of the method should not inconvenience the correspondents"
or in modern terms: "the security is solely in the key, not in keeping the
algorithm secret".

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