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5.8 Signing and encrypting

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.

C-c C-m s s
Digitally sign current MIME part using S/MIME.
C-c C-m s o
Digitally sign current MIME part using PGP.
C-c C-m s p
Digitally sign current MIME part using PGP/MIME.
C-c C-m c s
Digitally encrypt current MIME part using S/MIME.
C-c C-m c o
Digitally encrypt current MIME part using PGP.
C-c C-m c p
Digitally encrypt current MIME part using PGP/MIME.

Also See section `Security' in Message Manual.


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