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AES is secure in such a way that you cannot find the key even if you know (part of) the plaintext. So it is not possible (feasible) to deduce the key based on the file prefix to decrypt the complete file. I suspect this is the attack that you anticipate. Like woliveirajr said, you can just use the existing filename with a suffix like .enc. What you need to ...


If you are encrypting one file to one file, simply save the correct extension. Example: open test.pdf, encrypt the content, and save as test1.pdf, or test1.pdf.enc (so that you know that the file is encrypted and any pdf won't try to open it when you double click). If you are encrypting more than one file together (and, in the end, you have one big chunk of ...

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