The crypto used in 802.11 wireless networking has been cracked. The crack is devastating; it's fast and passive. Simply by listening, the 40-bit key can be cracked in 15 minutes. Worse, the crack scales linearly with the number of bits in the key, so raising the key length to 128 bits would raise the crack time to about an hour. 802.11 is used in such products as the Linksys Etherfast Wireless and the Apple Airport. From now on those products should be considered to be completely insecure.