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Article #1317

PGP weak on long messages (was: Re: pgp2.0 ... key length?)

#1317
From: E. Tye McQueen
Date: Sun, 04 Oct 1992 08:49
21 lines
1361 bytes
Well, this is probably too basic for sci.crypt and cross-posting
to alt.security *and* alt.security.pgp doesn't make much sense to
me so follow-ups have been directed to only alt.security.pgp.

lewis@aera8700.mitre.org (Keith Lewis) writes:
)PGP is essentially RSA performed on a bitmask which is used repeatedly on
)a single message.

Doesn't reusing the (encrypted) bit mask make long messages fairly
easy to crack if you have ideas as to the content of the plain text?
I guess the message would best be several times the length of the
bit mask for this to work.

Is it done this way to save computation time when en/decrypting?
Or is this to get around silly NSA restrictions?

Thanks,
 tye@spillman.com                         Tye McQueen, E.
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 Nothing is obvious unless you are overlooking something. 
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Technical Details
Message-ID: <1992Oct04.084900.19815@spillman.uucp>
Path: arc1-ca.pugleaf.net!sparky!uunet!spillman!tye
References: <1992Sep25.191759.25545@nevada.edu>

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Newsgroups: sci.crypt,alt.security,alt.security.pgp
Path: arc1-ca.pugleaf.net!sparky!uunet!spillman!tye
From: tye@spillman.uucp (E. Tye McQueen)
Subject: PGP weak on long messages (was: Re: pgp2.0 ... key length?)
Message-ID: <1992Oct04.084900.19815@spillman.uucp>
Date: Sun, 04 Oct 1992 08:49:00 GMT
Follow-Ups: alt.security.pgp
References: <1992Sep25.191759.25545@nevada.edu>
Organization: Spillman Data Systems
Lines: 21