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One of our users seems to have been hit by CryptoLocker. As a result, he has...

One of our users seems to have been hit by CryptoLocker. As a result, he has a hard drive full of encrypted files. The ransom-ware claims to have used public key encryption on the files.

If we know exact contents of some of the files prior to them being encrypted, would it be feasible to use those files to discover the private key?

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Answer #1

If CryptoLocker does its job properly, then no, knowing part of the cleartext will not help you recover the rest. If that helped, then the encryption system would be called weak against known-plaintext attacks. From what I read, it seems that the CryptoLocker authors were competent(*), so no such luck.

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