AirSnort

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AirSnort is a Linux utility (using GTK+) for decrypting WEP encryption on an 802.11b network. A Windows port also exists.

Scott Fluhrer, Itsik Mantin and Adi Shamir released a paper titled Weaknesses in the Key Scheduling Algorithm of RC4. Based on the security flaws described therein, Blake Hegerle and Jeremy Bruestle wrote a tool that only has to gather about five to ten million encrypted packets from a wireless access point before it can try to recover the wireless key. Depending on the environment this can take as little as a few minutes ,or, more commonly a few hours and possibly days.