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From: Richard Stallman <rms@gnu.org>
Newsgroups: gmane.emacs.gnus.general,gmane.emacs.devel
Subject: Re: encrypt.el in No Gnus 0.7
Date: Wed, 07 Nov 2007 02:56:08 -0500
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    Steganography is useful, in particular, and GnuPG doesn't support it.
    Users could hide secret information, or messages for other users, or
    watermarks.

Steganography is certainly useful, but the question is whether users
want to use encrypt.el.

    RS>     - pure Lisp ciphers for quick experimentation and sharing

    RS> That seems unimportant to me.

    I think cryptography is a field where experimentation is very
    important.  Wouldn't you like to see Emacs become a breeding ground for
    cryptography work?

Encryption programs generally need to be fast.
Emacs Lisp doesn't seem very good for the job.