Preserving privacy means not only hiding the content of messages, but also hiding who is talking to whom (traffic analysis). Much like a physical envelope, the simple application of cryptography within a packet-switched network hides the contents of messages being sent, but can reveal who is talking to whom, and how often. Onion Routing is a general-purpose infrastructure for private communication over a public network It provides anonymous connections that are strongly resistant to both eavesdropping and traffic analysis.
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