Engineers discover unique fingerprint for cell phones

Aug 02, 2013 by Bob Yirka weblog
Overall Procedure of Feature Extraction. Credit: Forensic Identification of GSM Mobile Phones, Jakob Hasse et al.

(Phys.org) —Law enforcement officials may soon have a new tool at their disposal—a device that can distinguish between cell phones based on their digital signal. In the never ending game of cat-and-mouse between law enforcement and criminals, this new advancement may give the good guys the upper hand—all due to a discovery by a team of engineers in Germany.

The development of the cell phone has led to new advances in both law enforcement and criminal evasion. Police officers use cell phones to communicate with one another, as do criminals. It didn't take long, however, for the police to figure out that they could track criminals as they talk on their cell phones using triangulation of cell towers. To keep from getting caught, criminals began using new evasion tactics such as modifying the built-in ID code on their cell phone or swapping out SIM cards—doing so made it nearly impossible for to track them down by their cell phone signals alone. This new advance by the engineers in Germany appears likely to thwart that strategy.

Working at the Technical University of Dresden, engineers Jakob Hasse, Thomas, Gloe and Martin Beck found that each of the separate components inside a cell phone has a degree of error. When all of the errors are taken together, as seen in the digital signal sent to a cell tower, the result can be read as a unique digital signal—or fingerprint. That means that no matter what criminals do to their cell phone—short of swapping out internal components—their phones will continue to emit a unique signal that can be read by a device and used to separate it out from all the other signals. Once that's done the location of the phone—and possibly the —can be calculated using triangulation of .

Unfortunately, a device to read and recognize the unique signature of cell phones is still in the research and development stage, though the engineers on the project report a nearly 98 percent success rate in correctly identifying a signal. Law enforcement would surely like to see that number bumped to 100 to avoid finding themselves occasionally raiding the wrong house.

Explore further: Millions without mobile phone service in Argentina

More information: Forensic Identi?cation of GSM Mobile Phones, Jakob Hasse et al. (PDF)

via Newscientist

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User comments : 4

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coryatjohn
5 / 5 (1) Aug 02, 2013
I wonder if the "burner" phone was taken into account here. No self respecting criminal would fall into this trap. Phones are cheap.
RFguy
1 / 5 (2) Aug 03, 2013
Won't work. Not specific enough.
Skepticus
1 / 5 (2) Aug 03, 2013
A metallic cover of a specific shape could distort the emitted signal (still with a usable levels) to a specific characteristic. Remove when you are done.
Anonym
1 / 5 (3) Aug 03, 2013
Criminals will always find a workaround in the "never ending game" between the police and civil liberties.

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