[47684] in Cypherpunks
Re: (none)
daemon@ATHENA.MIT.EDU (Simon Spero)
Mon Jan 22 13:47:01 1996
Date: Mon, 22 Jan 1996 10:38:46 -0800 (PST)
From: Simon Spero <ses@tipper.oit.unc.edu>
To: "Roy M. Silvernail" <roy@sendai.cybrspc.mn.org>
Cc: cypherpunks@toad.com
In-Reply-To: <960122.061235.3y2.rnr.w165w@sendai.cybrspc.mn.org>
On Mon, 22 Jan 1996, Roy M. Silvernail wrote:
> -----BEGIN PGP SIGNED MESSAGE-----
>
> > Note that RSA normally is used as probabilistic encryption: encrypt the
> > same plaintext twice, and you'll likely get two different ciphertexts.
>
> I think you're confusing PGP's use of random session keys and random
> padding with actual RSA encryption. Using RSA alone on a given
> plaintext will always give you the same ciphertext.
RSA used in a raw mode will always give the same plaintext for the same
cyphertext; however most uses of RSA use (or at least should use) PKCS1
random padding - thus the plaintext passed to RSA will be different each
time.
Simon
