“Computer scientists have devised an attack on the Tor privacy network that in certain cases allows them to deanonymize hidden service websites with 88 percent accuracy.  Hidden services allow people to host websites without end users or anyone else knowing the true IP address of the service. The deanonymization requires the adversary to control the Tor entry point for the computer hosting the hidden service. It also requires the attacker to have previously collected unique network characteristics that can serve as a fingerprint for that particular service. The new research underscores the limits to anonymity on Tor, which journalists, activists, and criminals alike rely on to evade online surveillance.”

http://arstechnica.com/security/2015/07/new-attack-on-tor-can-deanonymize-hidden-services-with-surprising-accuracy/

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