Advanced RAR Password Recovery (or simply ARPR) can be used to recover the lost password for a RAR archive. At the moment, there is no known method to extract the password from the compressed file; so the only available methods are "brute force" and dictionary-based attacks.





Here is a brief list of ARPR's advantages:

• ARPR has a convenient and easy to use user interface;
• ARPR works with one protected file at a time (multiple uses of ARPR is possible);
• all compression methods are supported;
• self-extracting archives are supported;
• you can select the custom character set for "brute-force" attack (non-English characters are supported);
• you can interrupt the program at any time. Resuming is supported;
• ARPR can work in the background, using the CPU only when it is in an idle state;
• ARPR can utilise either a customizable "brute-force" approach, or an effective dictionary-based approach. The different approaches can be used for all RAR types and compression methods using AES (Rijndael) 128-bit encryption, e.g., set the password length (range) of the character set used to generate the passwords, and many other options;
• A multilingual interface is provided.

more info @http://www.elcomsoft.com/arpr.html