NSA report on the Tor encrypted network

The following document is a 2006 research paper produced for the NSA's "Cryptanalysis and Exploitation Services" office. It lays out the technical features of Tor and proposes a number of theoretical and practical attacks, some of which the NSA developed and used in subsequent years. Among other things, the paper describes an NSA-written adaptation of Tor, "indistinguishable from an original Tor client," which enables the NSA to gather intelligence inside the network. It also describes two kinds of "denial of service" attacks against Tor, code-named Coil and Flower, which are used to divert would-be anonymous communications into open channels...


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