If the encrypted file is from one of the known formats, such as doc, jpg, mp3, etc., is it possible to reverse engineer it and decrypt it?
I "roughly" know the mechanic behind the AES encryption: Matrix operation, Row shifting, Column shuffling, all that stuff.
That's what makes AES "unbreakable", but that all seems built on the assumption of "you don't know what it was", what if you "know" what it was? at least what format it was? Is it possible to "break" it?