public key doubts

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1 total messages Started by vinge Wed, 11 Mar 1987 08:00

#103

Author: vinge
Date: Wed, 11 Mar 1987 08:00

23 lines
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I have a crypto question.

Classically, it seems like any crypto scheme with a fixed size key
fails if the enemy has enough plaintext with corresponding ciphertext.

With public key encryption, the enemy *by definition* can generate
as much plaintext/ciphertext as he wishes. I don't see anyone talk about this,
but it seems to me that this puts a real (and low) time limit on how
long one can afford to use a given public/private key pair. 

Comments?

-- Vernor


Darrell Long
Department of Computer Science and Engineering, C-014
University of California, San Diego
La Jolla, California  92093

ARPA: Darrell@Beowulf.UCSD.EDU
UUCP: sdcsvax!beowulf!darrell

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