(epa-last-coding-system-specified): New variable.

[elisp/epg.git] / README

diff --git a/README b/README
index 570197d..e02841f 100644 (file)
--- a/README
+++ b/README
@@ -1,19 +1,14 @@
 * What's this?
 
-EasyPG is yet another GnuPG interface for Emacs.  It consists of two parts:
-
-- "The EasyPG Assistant"
-  A GUI frontend of GnuPG
-- "The EasyPG Library"
-  A library to interact with GnuPG
-
-NOTE: EasyPG is neither a fork nor a re-implementation of PGG.
+EasyPG is a GnuPG interface for Emacs.  It has two aspects: convenient
+tools which allow to use GnuPG from Emacs (EasyPG Assistant), and a
+fully functional interface library to GnuPG (EasyPG Library).
 
 * Requirements
 
-** GNU Emacs 21.4 or XEmacs 21.4
+** GNU Emacs 21.4, XEmacs 21.4, or later
 
-** GnuPG 1.4.3
+** GnuPG 1.4.3 or later
 
 * Quick start
 
@@ -32,11 +27,53 @@ you can do some cryptographic operations on dired.
   M-x dired
   (mark some files)
   : e (or M-x epa-dired-do-encrypt)
-  (select recipients and click [OK])
+  (select recipients by 'm' and click [OK])
+
+* MUA Integration
+
+The EasyPG Library can be used in combination with various MUA (Mail
+User Agents).
+
+** CVS version of Gnus
+
+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-cache-passphrase
+  mml2015-passphrase-cache-expiry
+  mml2015-verbose
+
+NOTE: You don't need pgg-epg.el in this case.
+
+** PGG based MUA
+
+PGG is outdated PGP library used by old Gnus (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.
+
+Limitations of PGG
+
+- 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
+
+SEMI is the MIME library used by Wanderlust, cmail, T-gnus, etc.
+
+There is an EasyPG capable SEMI library called EMIKO-EasyPG.  It can
+be downloaded from the same site of the EasyPG distribution point.
 
 * 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.