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City London / / / Facility Massachusetts Institute of Technology / / IndustryTerm anonymous remailer protocol / presence protocol / onion router / introduction protocol / / Organization Massachusetts Institute of Technology / MIT / / Person George Danezis / Cliff Skolnick / Nick Mathewson / Roger Dingledine / Charlie / Bob / Whitfield Diffie / Alice / David Hopwood / Martin E. Hellman / Matthias Bauer / / Position MP / forward / / ProvinceOrState Massachusetts / / PublishedMedium IEEE Transactions on Information Theory / / Technology encryption / cryptography / instant messaging / 4 Introduction Protocol / presence protocol / introduction protocol / Instant Messaging Protocol / second-generation onion router / anonymous remailer protocol / / SocialTag 
Apres - A System For Anonymous Presence Ben Laurie Step 2, 17 Perryn Road, London W3 7LR, United Kingdom Abstract. If Alice wants to know when Bob is online, and they don’t want anyone else to know th