Do I Know You? - Efficient and Privacy-Preserving Common Friend-Finder Protocols and Applications

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Provided by: Aalto University
Topic: Security
Format: PDF
The increasing penetration of Online Social Networks (OSNs) prompts the need for effectively accessing and utilizing social networking information. In numerous applications, users need to make trust and/or access control decisions involving other (possibly stranger) users, and one important factor is often the existence of common social relationships. This motivates the need for secure and privacy-preserving techniques allowing users to assess whether or not they have mutual friends. This paper introduces the common friends service, a framework for finding common friends which protects privacy of non-mutual friends and guarantees authenticity of friendships.
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