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We set up two test beds at Lab Alliance partner Opus One's labs in Tucson, one for stations (clients running wireless network interface cards) and one for access points and wireless LAN switches. Both sets of tests were monitored using Dell laptop computers running Red Hat Linux 9 and a modified version of AirSnort, the open source Wired Equivalent Privacy (WEP) key recovery tool. We also made heavy use of our AirMagnet Handheld to diagnose minor interoperability issues between different wireless devices.
AirSnort is designed to recover the WEP keys of any network it sees, as quickly as possible. It does this by collecting all packets from all stations and all access points. We modified our version of this open source tool to only look at the packets sent from the device being tested. This change enabled us to identify whether it was the station or the access point that was vulnerable to AirSnort key recovery. We also modified AirSnort to print out the "weak" initialization vectors that it was using to guess the WEP key.
We used an IBM Thinkpad laptop with a 1.2 GHz processor and 512M-byte RAM running a clean installation of Windows 2000 SP4 to test each wireless PCMCIA card, connecting the station to a Cisco Aironet 350 access point. To test access points, we used the same laptop with a Cisco Aironet 350 card to generate traffic.
For each test, we used the Unix "ping" command with the flood option to generate a high rate of bidirectional traffic over the airwaves. We let the AirSnort laptop listen to the traffic for a minimum of 50 million packets, usually about 12 hours at the very high traffic rate we were generating.