How hackers intercept data from WiFi networks

Open wireless networks are rapidly becoming an important part of urban culture as modern digital nomads increasingly eschew offices in favor of coffee shops. With the rise in popularity of WiFi-enabled mobile computing devices and publicly accessible access points, a new kind of WiFi security threat is beginning to emerge. Security researchers are beginning to note increasing instances of so-called "evil twin" attacks, in which a malicious user sets up an open WiFi network and monitors traffic in order to intercept private data.