Gnus can digitally sign and encrypt your messages, using vanilla PGP
format or PGP/MIME or S/MIME. For decoding such messages, see the
mm-verify-option
and mm-decrypt-option
options
(see section 3.30 Security).
For PGP, Gnus supports two external libraries, GPG.EL and MAILCRYPT, you need to install at least one of them. The S/MIME support in Gnus requires the external program OpenSSL.
Instructing MML to perform security operations on a MIME part is done
using the C-c C-m s
key map for signing and the C-c C-m
c
key map for encryption, as follows.
Also See section `Security' in Message Manual.
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