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However, that feature won't really become useful until we move to a "directory guard" design as well. Edit this page - Suggest Feedback - Permalink Tell me about all the keys Tor uses Tor uses a variety of different keys, with three goals in mind: 1) encryption to ensure privacy of data within the Tor network, 2) authentication so clients know they're talking to the relays they meant to talk to, and 3) signatures to make sure all clients know the same set of relays.