New answers tagged gpg
Effectively, as @PSkocik, the file was empty. Apparently, those 900 bytes on it were header information regarding the encryption. Thank you all!
gpg seems to depend on a particular argument ordering (unfortunately not all command-line utilities allow as unrestricted argument ordering as possible) . It should work if you follow the pattern from the man page: gpg [--homedir dir] [--options file] [options] command [args] In your case: /usr/local/bin/gpg --output a.log --passphrase=mypassphrase ...
Volatile was discontinued with Squeeze; the replacement is suite-updates (in your case, wheezy-updates) on the standard mirrors: deb http://ftp.debian.org/debian wheezy-updates main You can add contrib non-free if necessary.
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