The remote host is missing an update to gnupg announced via advisory DSA 061-1.
The version of GnuPG (GNU Privacy Guard, an OpenPGP implementation) as distributed in Debian GNU/Linux 2.2 suffers from two problems: fish stiqz reported on bugtraq that there was a printf format problem in the do_get() function: it printed a prompt which included the filename that was being decrypted without checking for possible printf format attacks. This could be exploited by tricking someone into decrypting a file with a specially crafted filename. The second bug is related to importing secret keys: when gnupg imported a secret key it would immediately make the associated public key fully trusted which changes your web of trust without asking for a confirmation. To fix this you now need a special option to import a secret key. Both problems have been fixed in version 1.0.6-0potato1.