There are a couple of utilities I know of that capture packets travelling across a WLAN: AirSnort and WEPCrack. After gathering enough packets the keys can be successfully guessed! These programs are patches for your wireless NIC driver that put it into promiscuous mode.There are many weaknesses inherent in the RC4 algorithm and its implementation. The source code for it was even made public in 1994 after a hacker 'cracked' it. Essentially, the algorithm that WEP is based on, is now freeware.  John


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