Fixed.

[elisp/epg.git] / README

diff --git a/README b/README
index 187db0d..4604483 100644 (file)
--- a/README
+++ b/README
@@ -1,8 +1,16 @@
 * 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
 
@@ -14,17 +22,28 @@ to interact with GnuPG.
 
 * 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.
+
+PGG and gpg.el use `call-process-region' to communicate with a gpg
+subprocess.  Your passphrases may 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 with the core file.  `read-passwd' function clears passphrase
+strings by `(fillarray string 0)'.  However, it is not perfect.  Emacs
+does compaction of small strings in gc_sweep phase.  If GC happens
+before `fillarray', passphrase strings may be copied elsewhere in
+memory.  So, it is recommended that if you are done with passphrase
+you should clear it manually.  However, PGG and gpg.el enables
+passphrase caching by default.
+
+** Most GnuPG features are accessible from Emacs
+
+As the name indicates, EasyPG is inspired by GPGME (GnuPG Made Easy),
+and the library interface is close to GPGME.