Cachet: A Decentralized Architecture for Privacy Preserving Social Networking with Caching Shirin Nilizadeh Sonia Jahid Prateek Mittal Indiana University University of Illinois at University of California, Bloomington Urbana-Champaign Berkeley
[email protected] [email protected] [email protected] Nikita Borisov Apu Kapadia University of Illinois at Indiana University Urbana-Champaign Bloomington
[email protected] [email protected] ABSTRACT and (b) use of social contacts for object caching results in Online social networks (OSNs) such as Facebook and significant performance improvements. Google+ have transformed the way our society communi- cates. However, this success has come at the cost of user Categories and Subject Descriptors privacy; in today's OSNs, users are not in control of their C.2.4 [Computer-Communication Networks]: Dis- own data, and depend on OSN operators to enforce access tributed Systems|Distributed Applications; K.6.m control policies. A multitude of privacy breaches has spurred [Management of Computing and Information research into privacy-preserving alternatives for social net- Systems]: Miscellaneous|Security working, exploring a number of techniques for storing, dis- seminating, and controlling access to data in a decentral- ized fashion. In this paper, we argue that a combination General Terms of techniques is necessary to efficiently support the complex Algorithms, Security functionality requirements of OSNs. We propose Cachet, an architecture that provides strong Keywords security and privacy guarantees while preserving the main functionality of online social networks. In particular, Cachet privacy, peer-to-peer systems, social networking, caching protects the confidentiality, integrity and availability of user content, as well as the privacy of user relationships.