Challenger
==========

Challenger accellerates dictionary attacks on NETLMv1/MSCHAPv2 hashes by using 
a partial-bruteforce/rainbow-tablea hybrid technique. Much like traditional 
rainbow tables techniques, challenger has a tool (rtchallenge.py) to convert a
wordlist into a rainbow table. This is not normally possibe for
NETLMv1/MSCHAPv2 hashes, however, since they contain a unqiue challenge. Due to a 
design flaw, we can quickly recover two bytes of the underlying NT hash and 
use that as a crib to accellerate a rainbow-table style lookup against a pre-
processed dictionary. The end result is a speedup of about 65,000 times over a
plain dictionary attack in Python...not that I'm suggesting Python-based
dictionary attacks are exactly fast. If Challenger cannot find the relevant 
password, it outputs a hash compatible with Moxie Marlinspike's 
CloudCracker.com website which should always be able to recover the full NT 
hash for you.

Setup
-----

Before running challenger, replace wordlist.txt with a larger word list and execute rtchallenge.py to build the tables.

Use
---

   challenger.py <challenge> <NT or LM response hash>
   challenger.py '<CloudCracker hash from chapcrack>'
   challenger.py [-t | --test]  (demo mode)

For rainbow table-like attacks, use rtchallenge.py to generate
the appropriate rainbow tables and store the rainbow directory
in the same directory as ./challenger.py.

Please ensure you use single quotes (') when passing a CloudCracker/Chapcrack hash to Challenger in a *nix system, otherwise the '$' get interpreted as signifying environment variables.

Author
------

Challenger was created by Tim Ehrhart ([email protected]), just for fun.


Copyright
---------

Copyright 2013 by Tim Ehrhart

Licensed under the GPLv3: http://www.gnu.org/licenses/gpl-3.0.