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- Path: sparky!uunet!portal!cup.portal.com!Christopher_C_Lapp
- From: Christopher_C_Lapp@cup.portal.com
- Newsgroups: sci.crypt
- Subject: Hey, look, I didn't invent this stuff!
- Message-ID: <72785@cup.portal.com>
- Date: Sat, 2 Jan 93 09:28:45 PST
- Organization: The Portal System (TM)
- Distribution: usa
- Lines: 21
-
- Plaintext encryption can be used to militarily disarm an
- enemy. Suppose all traffic of an organization was first
- encrypted in meaningful plaintext that was at least
- partially empricially verifiable. Then >this< plaintext
- was encrypted with a compromisable standard-issue
- encrpytion scheme, and an adversary was given the
- means to decrypt this cover-decrypt, and read the
- plaintext. Now give the adversary a Coventry-type
- situation. Your true message may be: We need a sack
- of potatoes for the officers s dining room at base such
- and such. But the encrypted message (plaintext) reads :
- We have decided to bomb location [The Coventry ],
- and destroy adversary x s radar equipment. This
- plaintext message is then encrypted, in say, DES, and
- transmitted through the usual channels. Some latter-day
- Churchill on the adversary s side may decide to let the
- radar facility be bombed, to preserve his ability to
- monitory DES-level communicaitons. The originator of
- the message may >have< to bomb the radar facility, to
- maintain the illusion that the plaintext encrypt is actually
- a plaintext decrypt. Isn t the spy business fun?
-