WEPCrack is a tool that cracks 802.11 WEP encryption keys using the latest discovered weakness of RC4 key scheduling.

Tool Capabilities :
The current tools are Perl based, and are composed of the following scripts:
1) WeakIVGen.pl – This script allows a simple emulation of IV/encrypted output that one might observe with a WEP enable 802.11 Access Point. The script generates IV combinations that can weaken the secret key used to encrypt the WEP traffic

2) prism-getIV.pl – This script relies on output from Prismdump [or from Ethereal captures if libpcap has been patched for 802.11 monitor mode], and looks for IVs that match the pattern known to weakned secret keys. This script also captures the 1st byte of the encrypted output and places it and the weak IVs in a logfile.

3) WEPCrack.pl – This script uses data collected or generated by WeakIVGen to attempt to determine the secret key. It will work with either 40bit or 128bit WEP.

Additionaly, a script prism-decode.pl is included that will decode most 802.11 frame types. This tool is intended to be used with prismdump, but could also be used against Ethereal 802.11 saved captures. It might be useful for capturing SSIDs, AP MAC addresses, or authentication data.

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