In cases where a ransomware (like crytolocker) family has been detected, caught and reversed engineered, a number of security vendors globally have made this information public so that you can use the keys provided to unlock possible ransomware infections.
A new initiative between National High Tech Crime Unit of the Netherlands’ police, Europol’s European Cybercrime Centre and two cyber security companies – Kaspersky Lab and McAfee – have united with the common goal of assisting ransomware victims retrieve encrypted data and avoid ransom payments.
Together they have set up the “No More Ransom” website features advice to help prevent attacks, FAQ section and decryption tools but the best bit is the 'Cyrpto Sherffic' which offers the service where you are able to upload your encrypted file so they can then provide you with a link to an available decryption solution.
Note that the site promotes prevention as the availability of decryption solutions is not guaranteed. There are several countermeasures that can be taken to effectively prevent infection -
Find out how CyberHound offers protection here.