Just when you thought it was safe to raise an antenna and go wireless again, along comes another attack to make you think twice. A pair of security researchers, Erik Tews and Martin Beck, will present a new attack against WPA (Wi-Fi Protected Access) at the PacSec conference next week. If you're not up on wireless network technologies, WPA is the system developed to secure wireless network traffic after WEP was found to be too insecure. The basic purpose of WPA is to encrypt all data traffic between a wireless client and an access point (modulo the control packets, of …