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Although several wide-spread internet applications (e.g., job-referral services, dating services) can benefit from online matchmaking, protocols defined over the past two decades fail to address important privacy concerns. In this paper, the authors enhance traditional privacy requirements (e.g., user anonymity, matching-wish authenticity) with new privacy goals (e.g., resistance to off-line dictionary attacks, and forward privacy of users' identities and matching wishes), and argue that privacy-enhanced matchmaking cannot be provided by solutions to seemingly related problems such as secret handshakes, set intersection, and trust negotiation.
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