TorrentLocker is a new breed of ransomware that has been spreading lately. Like CryptoLocker and CryptoWall it encrypts files on a victim's machine and then demands ransom. The victim has to pay to get the decryption software that can decrypt the files. The researchers found that if you have both the original and the encrypted version of a single file that is over 2MB in size the entire keystream can be recovered, which makes it possible to recover all your files encrypted by TorrentLocker.
Read more here - http://digital-forensics.sans.org/blog/2014/09/09/torrentlocker-unlocked