AirDefense has unique, patented approach to making broken WEP encryption work: They flood the network with Wired Equivalent Privacy (WEP)-encrypted frames that disables the ability of a cracker to obtain enough traffic to extract the key. AirDefense says they developed this approach for the Payment Card Industry (PCI), which includes a huge range of retail establishments using legacy devices that are expensive to upgrade, or impossible, requiring replacement. AirDefense isn't saying much about their technique, although it makes a beautiful sort of sense. At Wi-Fi Planet, they aren't resting on their laurels, noting that they expect they will need to continue to evolve responses to improvements in active and passive WEP attacks. The cost of this WEP cloaking could be as little as $200 to $400 per site.