Irregular Expressions

Feb 22 2011   11:11PM GMT

Using John the Ripper to brute md5 hashes – Part 2

Dan O'Connor Dan O'Connor Profile: Dan O'Connor

Rainbow tables are a very very quick and effective way to figure out a password, but they have a big problem, and I mean big.  They are incredibly large, the more you pre-hash the bigger they get, they can be in the terabytes depending how many characters you are doing.

The other method is effective but trades the size of the pre-hashes to time.  You can do an incremental brute force of the hashes.

Typically I would use some dictionaries, and a list of known passwords.  You can get these from a variety of sources and I would recommend running more then one, they don’t take very long at all to run.  Once I have run through the lists I will start up the brute force and let it run.

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