The remote host is missing an update to gnupg announced via advisory DSA 1140-1. Evgeny Legerov discovered that overly large comments can crash gnupg, the GNU privacy guard - a free PGP replacement.
For the stable distribution (sarge) this problem has been fixed in version 1.4.1-1.sarge5. For the unstable distribution (sid) this problem has been fixed in version 1.4.5-1. We recommend that you upgrade your gnupg package. https://secure1.securityspace.com/smysecure/catid.html?in=DSA%201140-1