Since wireless phones – not only GSM but any other „freely movable” ones – have become popular, the attacks against them also have become more and mor
As there is no touchable medium between the phone and its base station, classical tools developed for detecting line tapping cannot be used. “Eavesdropping” on the emanated high frequency signal is very easy so manufacturers have been focusing on the protection of communication, the proper encryption of the conversation. The other focus point has been energy efficiency, battery life. During the last decade enormous improvements have been made but unfortunately, the most efficient high-power solutions have opened a backdoor for eavesdropping. Efficient power stages can emanate un-encrypted information. During the presentation some titbits of that hidden vulnerability will be shown.