3

I want retrieve documents from a password protected rar file? I know brute force and dictionary method. Is there any other method to get data?

5

The current version of RAR uses 128bit AES, which is very secure. A brute force attack will be useless; and while there are some known attacks on AES, none of them are of any practical use. The specific implementation of AES they use is well respected.

That leaves:

  • +1 for xkcd reference. I'd like to add, create a botnet consisting of the entire planets computers... – Jeff Jan 16 '13 at 12:49
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    Ah, no, when people say brute force against AES won't work, they really mean it. A botnet of all the worlds computers won't have time to crack that RAR file, because the Sun is going to be dead in only 5 billion years. – Graham Hill Jan 16 '13 at 14:04
  • Dictionary attacks can be surprisingly effective, as the Crack Me If You Can contest shows. However, you will also note that some of the rar files (rar-medium.rar and rar-hard.rar) were not cracked at all in the time limit (48 hours). – Ladadadada Jan 16 '13 at 23:24
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Using a password cracker . But it involves a dictionary attack . And Don't use brute force. 99% never works unless you are adrian lamo

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