California's Wireless Toll Tags Proven Insecure, Hackable
Security expert Nate Lawson has shown that he can not only access the tags and retrieve a user's account number, but can also modify an existing tag and reprogram it to have someone else's. This means that he could walk through a parking lot, wirelessly scan someone's transponder hanging in their window, then reprogram his own and drive on another customer's tab. In fact, he's already successfully scanned his own tag and reprogrammed others to share its account information. There are other systems in place at the toll booths, like cameras that photograph license plate numbers and drivers as cars go through the booths, but that's no excuse for the woefully bad security on these things.
Right now it's unlikely that many are exploiting these tags, so you won't see us trading ours in and going back to stopping and paying in cash -- at least not yet. [From: Technology Review]
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