[16777] in cryptography@c2.net mail archive
Re: how to tell if decryption was successfull?
daemon@ATHENA.MIT.EDU (Steven M. Bellovin)
Wed Feb 2 10:44:20 2005
X-Original-To: cryptography@metzdowd.com
X-Original-To: cryptography@metzdowd.com
From: "Steven M. Bellovin" <smb@cs.columbia.edu>
To: Andreas <ahasenack@terra.com.br>
Cc: cryptography@metzdowd.com
In-Reply-To: Your message of "Tue, 01 Feb 2005 17:29:43 -0200."
<41FFD8A7.6090200@terra.com.br>
Date: Wed, 02 Feb 2005 09:35:08 -0500
In message <41FFD8A7.6090200@terra.com.br>, Andreas writes:
>[newbie here]
>
>I was wondering how can one tell if some data was successfully
>decrypted. Isn't there an assumption going on about what the cleartext
>data should be? Text? Image? ZIP file? Ziped jpeg? Another cyphertext?
>rot-13?
There are a lot of ways to tell, but you generally have to have some
idea what you're looking for. For two examples of how to do it, see
http://www1.cs.columbia.edu/~smb/papers/probtxt.ps (or .pdf) and
http://www1.cs.columbia.edu/~smb/papers/recog.ps (or .pdf)
--Prof. Steven M. Bellovin, http://www.cs.columbia.edu/~smb
---------------------------------------------------------------------
The Cryptography Mailing List
Unsubscribe by sending "unsubscribe cryptography" to majordomo@metzdowd.com
