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Recipe 8.1 Encrypted Mail with Emacs
8.1.1 Problem
You use an Emacs mailer
(vm, rmail, etc.) and want to
send and receive encrypted email messages.
8.1.2 Solution
Use
mailcrypt.el
with GnuPG:
~/.emacs:
(load-library "mailcrypt")
(mc-setversion "gpg")
Then open a mail buffer, and use any Mailcrypt functions or variables
as desired:
Encrypt the mail message in the current buffer
Decrypt the mail message in the current buffer
Sign the mail message in the current buffer
Verify the signature of the mail message in the current buffer
Insert your public key, in ASCII format, into the current buffer
...and many more.
8.1.3 Discussion
Mailcrypt is an
Emacs package for encrypting, decrypting, and cryptographically
signing email messages. Once you have installed
mailcrypt.el in your Emacs load path, e.g., by
installing it in /usr/share/emacs/site-lisp, and
loaded and configured it in your ~/.emacs file:
(load-library "mailcrypt")
(mc-setversion "gpg")
compose a mail message in your favorite Emacs-based mailer. When done
writing the message, invoke:
M-x mc-encrypt
(or select the Encrypt function from the Mailcrypt menu).
You'll be prompted for the recipient, whose public
key must be on your GnuPG keyring:
Recipients: jones@example.com
and then asked whether you want to sign the message, which is an
optional step and requires your GnuPG passphrase.
Sign the message? (y or n)
Then voilà , your message becomes
GnuPG-encrypted for that recipient:
-----BEGIN PGP MESSAGE-----
Version: GnuPG v1.0.6 (GNU/Linux)
Comment: Processed by Mailcrypt 3.5.8 and Gnu Privacy Guard
hQEOAxpFbNGB4CNMEAP/SeAEOPP6XW+uMrkHZ5b2kuYPE5BL06brHNL2Dae6uIjK
sMBhvKGcS3THpCcXzjCRRAJLsquUaazakXdLveyTRPMa9J7GhRUAJvd8n7ZZ8iRn
...
-----END PGP MESSAGE-----
Finally, send the message normally.If you receive an encrypted message, and you already have the
sender's key (indexed by her email address) on your
GnuPG public keyring, simply invoke:
M-x mc-decrypt
for
the buffer containing the message. If you receive a signed message,
check the signature by invoking: [Recipe 7.15]
M-x mc-verify
Mailcrypt can be finicky about the buffer contents. If all else
fails, save the encrypted message to a file and decrypt it with
gpg manually. [Recipe 7.5]By default, Mailcrypt will remember your GnuPG passphrase once
enteredbut only for the duration of the current Emacs session.
You can run
mc-deactivate-passwd
to
force Mailcrypt to erase your passphrase from its memory immediately.The load-library code given earlier will cause
your startup file to abort if Emacs cannot find Mailcrypt. To have it
load conditionally, use this instead:
(if (load-library "mailcrypt") t)
(mc-setversion "gpg"))
8.1.4 See Also
The official web site for
Mailcrypt is
http://mailcrypt.sourceforge.net.
To list all Mailcrypt functions and variables in Emacs,
try:
M-x apropos mc-
