* What's this?
EasyPG is a GnuPG interface for Emacs. It has two aspects: convenient
-tools which allows to use GnuPG from Emacs (EasyPG Assistant), and a
-fully functional interface library to GnuPG (EasyPG Library.)
+tools which allow to use GnuPG from Emacs (EasyPG Assistant), and a
+fully functional interface library to GnuPG (EasyPG Library).
* Requirements
* MUA Integration
The EasyPG Library can be used in combination with various MUA (Mail
-User Agents.)
+User Agents).
** CVS version of Gnus
-CVS version of Gnus supports EasyPG natively, simply put the following
-line into your ~/.emacs.
-
- (setq mml2015-use 'epg)
-
-Other options which affect on the binding are
+CVS version of Gnus uses EasyPG by default. To make sure of that,
+check mml2015-use set to 'epg. Other options which affect on the
+EasyPG are
mml2015-signers
mml2015-encrypt-to-self
mml2015-passphrase-cache-expiry
mml2015-verbose
-NOTE: You need not to install pgg-epg.el in this case.
+NOTE: You don't need pgg-epg.el in this case.
** PGG based MUA
-PGG is somewhat outdated PGP library used by old Gnus, MH-E, etc.
+PGG is outdated PGP library used by old Gnus (<= v5.11), MH-E, etc.
+
+There is a PGG backend written EasyPG called pgg-epg.el. However,
+EasyPG API is a superset of PGG and pgg-epg.el provides nothing but
+compatibility with PGG.
-There is a PGG backend using EasyPG called pgg-epg.el. However,
-EasyPG API is a superset of PGG, so pgg-epg.el just emulates the old
-behavior of pgg.el. Major features which PGG lacks are
+Limitations of PGG
-- Key selection user interface
-- Diagnosis interface to the verify operation
-- Web of trust
-- S/MIME using gpgsm
+- PGG doesn't have a user interface to select keys for typical
+ cryptographic operations
+- PGG can't handle messages signed with multiple keys correctly
+- PGG trusts any keys for encryption
** SEMI based MUA
* Security
-There are security pitfalls around Emacs.
+There are security pitfalls around Emacs. EasyPG is written with
+avoiding them.
** Passphrase may leak to a temporary file.