Evil Twin

Evil twin is a type of Wi-Fi attack, similar in nature to Web site spoofing and e-mail phishing attacks. Here’s how an evil twin attack works:

A hacker sets its service identifier (SSID) to be the same as an access point at the local hotspot or corporate wireless network. The hacker disrupts or disables the legitimate AP by disconnecting it, directing a denial of service against it, or creating RF interference around it. Users lose their connections to the legitimate AP and re-connect to the “evil twin,” allowing the hacker to intercept all the traffic to that device. [Source: Wi-Fi Planet]