Wired News had an article on HOPE, where there was a presentation by "Lady Ada", aka Limor, on a cell phone jammer. I was thoroughly intrigued, because I've been wanting to design one myself. The trick is getting the frequencies and tuning right. Then you just have to build a radio that broadcasts noise instead of signal. Cool.
Anyway, Limor's website has some nifty ideas. Even if her front page menu doesn't seem to like either IE or Firefox very well (though FF works better). The "Atmex" setup also looks pretty sweet.
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