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In the last few years, there has been a good deal of effort put into the research and standardization of P2P-based VoIP signaling, commonly called P2PSIP. However, there has been one important issue which has not been dealt with adequately, privacy. Specifically location privacy, and privacy of social interaction in terms of who is communicating with whom. This paper presents Pr2-P2PSIP, a Privacy-Preserving P2PSIP signaling protocol for VoIP and IM. The contribution is primarily a feasibility study tackling the privacy issues inherent in P2PSIP. The paper leverages standard security protocols as well as concepts and experiences learned from other anonymization networks such as Tor and I2P where applicable.
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