Voyager 2 Speaking in Code

"NASA may have to bust out an Enigma Machine to figure out what's going on with the Voyager 2 probe, the second most distant human-made object in space.

Yesterday mission managers at the Jet Propulsion Laboratory in Pasadena announced that the craft recently started sending back science data in a format no one on Earth can decode. "

http://blogs.nationalgeographic.com/blogs/news/breakingorbit/2010/05/voyager-2-speaking-in-code.html