Didier Stevens

Sunday 23 November 2008

Quickpost: WiFi Availability

Filed under: Quickpost,WiFi — Didier Stevens @ 11:01

This new video shows how a WiFi camera can be jammed by another wireless device. I produced it for my last talk at the office, illustrating the concept of availability in secure systems.

A WiFi camera, operating on channel 1, is streaming video. When I switch on an analogue, wireless babycam, you see a strong signal appearing near channel 9 (watch the SPECTRAL VIEW of the Wi-Spy spectrum analyzer, e.g. the window in the upper-left corner). After some time, I switch the babycam to a channel near channel 1 of the WiFi camera. Now the transmission of the babycam jams the transmission of the WiFi camera, and we lose connectivity.

Powering off the babycam restores the WiFi connection.

YouTube, Vimeo and XviD hires.


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