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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 [removed] Abstract. If Alice wants to know when Bob is online, and they don’t want anyone else to know th