At the Chaos Computer Club Congress in Berlin, Germany on Monday, researchers from the University of Regensburg delivered a new warning about the Tor anonymizer network, a system aimed at hiding details of a computer user’s online activity from spying eyes.

The attack doesn’t quite make a surfer’s activity an open book, but offers the ability for someone on the same local network—a Wi-Fi network provider, or an ISP working at law enforcement (or a regime’s) request, for example—to gain a potentially good idea of sites an anonymous surfer is viewing.

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