Cracking password-protected RAR archives is not an easy task because RAR/WinRAR archiver version 2.x used its proprietary, but rather strong encryption algorithm. At least no RAR 2.0 attacks were known except brute force.
Starting from version 3.0, RAR has been using a strong AES algorithm, which doesn't allow any attacks more effective than the brute force. Besides, the encryption is implemented so that brute force speed on modern computer is very low, about 100 passwords per second. This carries inference that RAR 3.x system is the strongest between popular encryption systems in the context of brute force. This means you couldn't recover RAR password longer than 6-7 symbols if you have no information about the password.
The cRARk program is designed to determine a forgotten password for RAR-archives. This program operates adequately with RAR-archives versions 2.x and 3.x. A command-line utility uses Password Cracking Library 2.0 that supports special password recovery language. Multi-volume, self-extracting, encrypted headers archives supported. Highly optimized for all modern processors, including support for NVIDIA CUDA technology.
To proceed with cRARk program you need a computer with the Pentium compatible processor or later. It is recommended to use as powerful processor as possible (the code is optimized for Pentium III/4/AMD/Core 2).
cRARk is the tool for professionals, no GUI or great service is provided. But it tries to maximize your abilities for passwords definition and to minimize search time. cRARk uses Password Cracking Library (PCL), a very powerful tool allowing you to define rules to generate passwords.
The rate of password search should be about of 100 password per second on modern powerful computer, so finding the 6-characters password of lower case Latin letters will need about a month. Rate for dictionary attack is about 50 pass/sec. The stored files rate is slower and depends of file length.
Advantages of cRARk are:
§ Absolutely free.
§ One of the fastest RAR password recovery software, uses extremely optimized MMX & SSE code.
§ Support of RAR password recovery on NVIDIA GPU using CUDA technology.
§ Multi-volume, self-extracting, encrypted header archives support.
§ Unique PCL language which is extremely efficient if user remembers any information about a forgotten password.
§ Portability (DOS, Windows, Linux, Solaris, Mac OS versions are available).
Author: Pavel Semjanov
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