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I would like to bypass the lock on a .rar archive, is this possible?

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All things are possible. But "how to crack security on a file" is probably pretty badly off-topic for AskUbuntu. – Jim Salter Nov 24 '12 at 0:27

closed as off topic by mikewhatever, Ringtail, hhlp, Mitch, Mik Nov 24 '12 at 17:21

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AES is impractical to break.

This is impossible by definition. RAR uses pretty good cryptography, in fact 128-bit AES, which has insofar never been cracked via cryptanalysis or brute-force. You may want to try to find another format of the same archive with no security or one that is trivial to break, since this one will not be breakable.

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