* What's this?
-EasyPG is yet another GnuPG interface for Emacs. It consists of a
-transparent file encryption application and easy-to-use elisp library
-to interact with GnuPG.
+EasyPG is yet another GnuPG interface for Emacs. It consists of two
+parts: transparent file encryption utility and easy-to-use elisp
+library to interact with GnuPG.
+
+* Requirements
+
+** GNU Emacs 21.4 or later
+
+** XEmacs 21.4 or later
+
+** GnuPG 1.4.3 or later
* Quick start
* Advantages over other competitors
+There are many competitors of EasyPG such as Mailcrypt, PGG, gpg.el,
+etc. EasyPG has some advantages over them.
+
** EasyPG avoides potential security flaws of Emacs.
-*** `call-process-region' writes data in region to a temporary file.
-PGG and gpg.el use `call-process-region' to communicate with a
-subprocess "gpg". So, your passphrases may leak to the filesystem.
+*** `call-process-region' writes data in region to temporary files.
+
+`call-process-region' writes data in region to temporary files. PGG
+and gpg.el use `call-process-region' to communicate with a gpg
+subprocess. Your passphrases leak to the filesystem!
*** There is no way to clear strings safely.
-To prevent passphrases from been stealing from cores, `read-passwd'
-function clears passphrase strings by `(fillarray string 0)'.
-However, it is not enough. In GC sweep phase, Emacs does compaction
-on small strings. If GC happens before `fillarray', passphrase
-strings may be copied elsewhere in the memory.
-PGG and gpg.el enables passphrase caching by default.
+If Emacs crashed and dumps core, passphrase strings in memory are also
+dumped within the core file. `read-passwd' function clears passphrase
+strings by `(fillarray string 0)'. However, Emacs performs compaction
+in gc_sweep phase. If GC happens before `fillarray', passphrase
+strings may be moved elsewhere in memory. It is recommended that as
+soon as you are done with passphrase you should clear it manually.
+However, PGG and gpg.el can keep passphrase strings in cache for a
+while and this behavior is their default!
+
+** GnuPG features are directly accessible from Emacs
+
+Other competitors provide only specific features of GnuPG since they
+still support PGP 2.*, 5.*, 6.*. As the name indicates, EasyPG is
+inspired by GPGME (GnuPG Made Easy), and the library interface is
+close to GPGME. With EasyPG you can benefit from a lot of features of
+GnuPG.