Over the past few months, one of the most dangerous viruses affecting computers has been Cryptolocker. Once infected, the virus encrypts all of the document files on your PC, and then demands payment (usually by Bitcoin) in order to divulge the necessary decryption key. While it's possible to remove the virus with standard antivirus software, and thus stop the infection spreading any further, the encrypted files remained encrypted.
It turns out that some of the key servers used by the Cryptolocker scammers had been intercepted by the authorities, and they managed to capture enough information to allow them to decrypt the documents of anyone whose computer had been affected.
So, if your PC was affected by Cryptlocker, or you know someone whose machine was, head to https://www.decryptcryptolocker.com/ and upload one of your encrypted files. This will allow the site to determine the code for unlocking all of the files on the affected PC. Full details are on the site.
Although I haven't tested this service, as I was lucky enough to escape being infected by Cryptolocker, I know of one acquaintance who tried it with complete success. Also, the unlocking service is provided by 2 reputable security companies.
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