James Grime, of the Enigma project and guest editor of the February 2012 code month at Nrich, has posted a code breaking challenge on his YouTube channel singingbanana. The prize is a signed copy of Simon Singh’s The Code Book. You can get the ciphertext to decrypt along with a couple of clues presented with James’ trademark charm in the video singingbanana code challenge 2012. The winner and solution will be announced in March.
(Edited 11:28 to add link to Nrich Codes and Ciphers – February 2012 page.)