Thread View: mod.os
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Started by Darrell Long
Wed, 18 Mar 1987 21:52
Re: public key doubts
Author: Darrell Long
Date: Wed, 18 Mar 1987 21:52
Date: Wed, 18 Mar 1987 21:52
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1509 bytes
> With public key encryption, the enemy *by definition* can generate
> as much plaintext/ciphertext as he wishes...
> 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.
He can generate as much plaintext/ciphertext as he wishes, but it's not
going to *tell* him anything that the public key doesn't already tell him.
The whole point of known-plaintext attacks is that they make it easier to
tell how the stuff was encrypted. With a public-key system, you already
know the encryption technique, and a known-plaintext attack doesn't buy
you anything. That's my understanding, anyway -- I'm not an expert on this.
The real cryppies hang out :-) in sci.crypt.
Henry Spencer @ U of Toronto Zoology
{allegra,ihnp4,decvax,pyramid}!utzoo!henry
--
Darrell Long
Department of Computer Science & Engineering, UC San Diego, La Jolla CA 92093
ARPA: Darrell@Beowulf.UCSD.EDU UUCP: darrell@sdcsvax.uucp
Operating Systems submissions to: mod-os@sdcsvax.uucp
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