So I was wondering about something, but for the simplicity, consider this example:

  1. You have a file with n encrypted files in it, of which one is called 'Note.txt'
  2. You also happen to have another file (not in the RAR) called 'Note.txt' which is an exact copy of the file within the RAR, but this is not encrypted!

Is it possible to 'reverse-retrieve' the password used to encrypt the files within the RAR?


What your describing here is a called a known-plaintext attack (KPA). WinRAR, as old as V3.0, uses AES-128 to encrypt files. As far as we know, AES isn't susceptible to KPAs.

  • Short, direct, accurate and answers the question. Thanks! – John Cast Feb 19 '14 at 11:16

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