Security → EZ Pass privacy issues

E-ZPasses Get Read All Over New York (Not Just At Toll Booths)

....The man, who goes by the Internet handle “Puking Monkey,” did an analysis of the many ways his car could be tracked and stumbled upon something rather interesting: his E-ZPass, which he obtained for the purpose of paying tolls, was being used to track his car in unexpected places, far away from any toll booths.

Puking Monkey is an electronics tinkerer, so he hacked his RFID-enabled E-ZPass to set off a light and a “moo cow” every time it was being read. Then he drove around New York. His tag got milked multiple times on the short drive from Times Square to Madison Square Garden in mid-town Manhattan….

“The tag ID is scrambled to make it anonymous. The scrambled ID is held in dynamic memory for several minutes to compare with other sightings from other readers strategically placed for the purpose of measuring travel times which are then averaged to develop an understanding of traffic conditions,” says TransCore spokesperson Barbara Catlin by email. “Travel times are used to estimate average speeds for general traveler information and performance metrics. Tag sightings (reads) age off the system after several minutes or after they are paired and are not stored because they are of no value. Hence the system cannot identify the tag user and does not keep any record of the tag sightings.”

In other words, reading of the E-ZPasses won’t be very useful for uniquely tracking you or your speed, but it’s a reminder once again that if you accept some kind of tracking device, it may be used in ways you wouldn’t expect.