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SUMMARY:DP5: Privacy-preserving Presence Protocols - Ian Goldberg\, Univer
 sity of Waterloo [currently on sabbatical at the University of Cambridge]
DTSTART:20140923T130000Z
DTEND:20140923T140000Z
UID:TALK54244@talks.cam.ac.uk
CONTACT:Laurent Simon
DESCRIPTION:*Abstract:*\nUsers of social applications like to be notified 
 when their\nfriends are online. Typically\, this is done by a central serv
 er keeping\ntrack of who is online and offline\, as well as of the complet
 e friend\ngraph of users.  However\, recent NSA revelations have shown tha
 t address\nbook and buddy list information is routinely targetted for mass
 \ninterception.  Hence\, some social service providers\, such as activist\
 norganizations\, do not want to even possess this information about their\
 nusers\, lest it be taken or compelled from them.\n\nIn this talk\, we pre
 sent DP5\, a new suite of privacy-preserving presence\nprotocols that allo
 w people to determine when their friends are online\n(and to establish sec
 ure communications with them)\, without a\ncentralized provider ever learn
 ing who is friends with whom.  DP5\naccomplishes this using an implementat
 ion of private information\nretrieval (PIR)\, which allows clients to retr
 ieve information from\nonline databases without revealing to the database 
 operators what\ninformation is being requested.\n\n*Bio:* \nIan Goldberg i
 s an Associate Professor of Computer Science and a\nUniversity Research Ch
 air at the University of Waterloo\, where he is a\nfounding member of the 
 Cryptography\, Security\, and Privacy (CrySP)\nresearch group.  His resear
 ch focuses on developing usable and useful\ntechnologies to help Internet 
 users maintain their security and privacy.\nHe is a Senior Member of the A
 CM and a winner of the Electronic Frontier\nFoundation's Pioneer Award.  H
 e is currently on sabbatical as a Visiting\nFellow at Clare Hall\, Univers
 ity of Cambridge.
LOCATION:Lecture Theatre 2\, Computer Laboratory\, William Gates Building
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