* Security consideration
+There are security pitfalls around Emacs.
+
** Passphrase may leak to a temporary file.
`call-process-region' writes data in region to a temporary file.
The EasyPG Library does not use `call-process-region' to communicate with a gpg
subprocess.
-** There is no way to clear passphrase safely.
+** Passphrase may be stolen from a core file.
If Emacs crashes and dumps core, Lisp strings in memory are also
dumped within the core file. `read-passwd' function clears passphrase