Protecting access privacy of cached contents in information centric networks

Authors:
Abedelaziz Mohaisen;Xinwen Zhang;Max Schuchard;Haiyong Xie;Yongdae Kim
Affiliations:
Verisign Labs, Reston, VA, USA;Huawei Technologies, Santa Clara, CA, USA;University of Minnesota, Minneapolis, MN, USA;Huawei Technologies, Santa Clara, CA, USA;Korea Advanced Institute of Science and Technology, Daejeon, South Korea
Venue:
Proceedings of the 8th ACM SIGSAC symposium on Information, computer and communications security
Year:
2013

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Abstract

In recently proposed information centric networks (ICN), a user issues "interest" packets to retrieve contents from network by names. Once fetched from origin servers, "data" packets are replicated and cached in all routers along routing and forwarding paths, thus allowing further interests by other users to be fulfilled quickly. However, the way ICN caching works poses a great privacy risk: the time difference between responses for an interest of cached and uncached content can be used as an indicator to infer whether or not a near-by user has previously requested the same content as that requested by an adversary. This work introduces the extent to which the problem is applicable in ICN and provides several solutions that try to strike a balance between their cost and benefits, and raise the bar for the adversary to apply such attack.