Scalable and private media consumption with Popcorn.
Trinabh Gupta, Natacha Crooks, Srinath Setty, Lorenzo Alvisi, Michael Walfish · 2015
Abstract This paper describes the design, implementa-tion, and evaluation of Popcorn, a media content delivery system that provably hides clients ’ media consumption. Popcorn relies on a powerful cryptographic primitive: pri-vate information retrieval (PIR). With novel refinements that leverage the properties of PIR protocols and of media streaming, we have developed a system that cheaply hides media consumption, scales to the size of Netflix’s library (8,000 movies), and respects current controls on media dissemination. The per-request cost in Popcorn is 3.87× the per-request cost of a non-private system. 1 Introduction and