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The provision of content confidentiality via message encryption is by no means sufficient when facing the significant privacy risks present in online communications. Indeed, the privacy literature abounds with examples of traffic analysis techniques aimed to reveal a great deal of information, merely from the knowledge, even if probabilistic, of who is communicating with whom, when, and how frequently. Anonymous-communication systems emerge as a response against such traffic analysis threats.doi:10.1016/j.comnet.2014.04.007 fatcat:7fgnqqdionbwlljefng75hcrha