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PRIVATE INFORMATION RETRIEVAL AND DISSENT

Dissent is an anonymous communication system that offers much stronger anonymity guarantees than Tor. Dissent clients efficiently publish anonymous messages, but any response must be broadcast to all clients. This approach does not scale to many clients or large responses. We’ve developed a private information retrieval scheme that enables clients to receieve responses without the bandwidth burden of broadcasting. Our protocol reduces bandwidth usage from quadratic in the number of clients to linear in the number of clients, while maintaining the same anonymity guarantees as Dissent.