Wikipedia The National Security Agency and its UK counterpart have made repeated and determined attempts to identify people using the Tor anonymity service, but the fundamental security remains intact, as top-secret documents published on Friday revealed.

The classified memos and training manuals—which were leaked by former NSA contractor Edward Snowden and reported by The Guardian, show that the NSA and the UK-based Government Communications Headquarters (GCHQ) are able to bypass Tor protections, but only against select targets and often with considerable effort. Indeed, one presentation slide grudgingly hailed Tor as “the king of high-secure, low-latency Internet anonymity.” Another, titled “Tor Stinks,” lamented: “We will never be able to de-anonymize all Tor users all the time.” An article published separately by The Washington Post also based on documents provided by Snowden concurred. 2     

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