There is a challenge to break the DGA algorithm.
A file (published on Nov 30th 2012) has been encoded and the decoding key will be made public on March 17th 2013 – end date for the competition.
Your challenge is to decode the file without its key. Win $10,000 if decrypting the challenge file.
Disclosure: Below is my personal referral link to the challenge http://urlt.ag/hlhR