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Rainbow Tables
create a string generator. preferable using a wordlist and a bruteforcer. run those through an encryption method (md5, sha1, etc) and then output the results of that to a file. then load the file into what ever is wanted the rainbow tables.
rainbow tables are simply precomputed hashes, it saves time when you actually need to crack things. :)
lol close :P
rainbow tables are actually like chains. i wrote a big rant.. but it sucked… so go read this instead