yet another application for white noise analysis, this time to serve as a caller / route id for calls.

The tool is called PinDr0p, and works by analysing the various characteristic noise artifacts left in audio by the different types of voice network — cellular, VoIP etc. For instance, packet loss leaves tiny gaps in audio signals, too brief for the human ear to detect, but quite perceptible to the PinDr0p algorithms. Vishers and others wishing to avoid giving away the origin of a call will often route a call through multiple different network types. This system can be used to differentiate telephone calls from your bank from telephone calls from someone in Nigeria pretending to be from your bank.

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