john the ripper

John the ripper is a password hash cracking tool that is available free for both unix/linux and Windows platforms. It autodetects the type of hash and by default uses a hybrid approach of dictionary and brute force attacks to attempt to crack the hash as quickly and efficiently as possible. It can use a wide variety of command line options and variable dictionary word files.

john the ripper – [openwall.com]

John the Ripper is a fast password cracker, currently available for many flavors of Unix (11 are officially supported, not counting different architectures), Windows, DOS, BeOS, and OpenVMS. Its primary purpose is to detect weak Unix passwords. Besides several crypt(3) password hash types most commonly found on various Unix flavors, supported out of the box are Kerberos AFS and Windows NT/2000/XP/2003 LM hashes, plus several more with contributed patches.

There is also a professional version:

John the Ripper Pro builds upon the free John the Ripper to deliver a commercial product better tailored for specific operating systems. It is distributed primarily in the form of “native” packages for the target operating systems.

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