System to Trace Call Paths Across Multiple Networks [telecom]


Posted October 5, 2010 Atlanta, GA

ATLANTA - October 5, 2010 - Phishing scams are making the leap from email to the world's voice systems, and a team of researchers in the Georgia Tech College of Computing has found a way to tag fraudulent calls with a digital "fingerprint" that will help separate legitimate calls from phone scams.

Voice phishing (or "vishing") has become much more prevalent with the advent of cellular and voice IP (VoIP) networks, which enable criminals both to route calls through multiple networks to avoid detection and to fake caller ID information. However each network through which a call is routed leaves its own telltale imprint on the call itself, and individual phones have their own unique signatures, as well.

Funded in part by the National Science Foundation, the Georgia Tech team created a system called "PinDr0p" that can analyze and assemble those call artifacts to create a fingerprint-the first step in determining "call provenance," a term the researchers coined. The work, described in the paper, "PinDr0p: Using Single-Ended Audio Features to Determine Call Provenance," was presented at the Association for Computing Machinery's Conference on Computers and Communications Security, Oct. 5 in Chicago.


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Monty Solomon
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Monty Solomon wrote in :

I mailed the question to the media contact for this publication (who forwarded it to the author) : "Can this system deal with electromechanical exchanges with their own noises, clicks and clangs". Electromechanical exchanges are quite rare but I imagine they add their own specific audio fingerprints.

The researcher answered that that was not part of the current research and implementation, but it might be interested to look at that aspect too.

Koos van den Hout

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