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OTP - Reusing key IS SECURE! PROVED!
@Alvin : Then, the keys are used only once and, there we go, you re-discovered OTP once again ! Congrats ! :-)
Is cryptanalysis of CTB-Locker really impossible?
I didn't mean "breaking ECC" or "breaking AES", I was more thinking about an error in the way the things have been arranged to build the whole encryption scheme or specificities that are linked to the very peculiar way the encryption is used here. For example, if you have a partial back-up of your file, you will have access to a reasonable quantity of cleartext/ciphertext couple that you may use. Or, is there a flaw in the entropy of the chosen keys... But, of course, I believe in the security of ECC and AES... I am not that naive !