Emacs not using cached passphrase for symmetric encryption in Fedora 17

[Hilbert]

Emacs in Fedora 17 has regressed, with a reappearance of this old bug
http://forums.fedoraforum.org/showthread.php?t=246102 in the handling of encrypyed files.

The problem is that emacs ignores the "cache passphrase" option

(setq epa-file-cache-passphrase-for-symmetric-encryption t)

in the .emacs setup file (see http://www.gnu.org/software/emacs/ma..._mono/epa.html). So when you save a symmetrically encrypted file, instead of using the cached passphrase, emacs throws up a dialog box asking you to type it in again (twice).

Last time this was caused by having gnupg2 installed without gnupg. It was solved by allowing gnupg to be installed along with gnupg2. But now I have both installed, and the bug has reappeared. Perhaps emacs is using gnupg2 "by mistake"? But I can't uninstall gnupg2 because too many things depend on it.

[Hilbert]

According to http://www.emacswiki.org/emacs-en/EasyPG this problem can be fixed by telling emacs not to use gpg-agent to get the passphrase. Add this line to .emacs:

(setenv "GPG_AGENT_INFO" nil)

This worked for me.