Quote:
Originally Posted by HarryT
Even in that circumstance, all you could do would be to try and encrypt the original file with every possible key until you got a match for the encrypted file. For a 16-digit credit card number, such a "brute force" approach would probably be impractical.
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That's why I said theoretically
And Z, watermarking with a sensitive thing is not what I had in mind! But would you distribute a file, which is encrypted with your CC and watermarked with your full name?