John the Ripper is a fast password cracker, currently available for many flavors of Unix (11 are officially supported, not counting different architectures), DOS, Win32, and BeOS. Its primary purpose is to detect weak Unix passwords, but a number of other hash types are supported as well. This is the current development version which offers significant performance improvements over the 1.6 release, but no documentation and charset files are provided, and more testing is needed.
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