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Backtrack: John The Ripper Tips & Examples

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Feb 112012

You might also want to see my article Installing JTR On Backtrack for Multiprocessor Cores

I am too lazy to restore the old version of this file from my old website (it was hosted for years on mambo and I am just too lazy to do the db conversion). Anyways, this website serves a couple of purposes, first is to keep some of my own notes handy and second to help others. With that in mind, here is a collection of tips on using john the ripper:

Prepare Linux Shadow Passwords

Source code

umask 077
./unshadow /etc/passwd /etc/shadow > mypasswds

Backtrack: Multicore Processor Password Cracking With John The Ripper

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Feb 112012

Lets face it, John the Ripper has been around a long time and the reason its been around a long time is because its damn good at cracking passwords. Yea, hashcat and oclhashcat are great for gpu cracking, but it doesn’t support as many algorithms as JTR. So, imagine my surprise when I fire up John The Ripper on backtrack 5 64 bit and find out it is using a single CPU. That is letting a potential 75% of my system sit there wanting to do something. Luckily the fix is easier than fixing a sandwich.

If you already have jtr installed, you may want to see my john tips article.

First, lets grab the jumbo sourcecode….