A Peer-to-Peer Content-Distribution Scheme Resilient to Key Leakage

Tatsuyuki MATSUSHITA  Shinji YAMANAKA  Fangming ZHAO  

IEICE TRANSACTIONS on Information and Systems   Vol.E99-D   No.12   pp.2956-2967
Publication Date: 2016/12/01
Publicized: 2016/08/25
Online ISSN: 1745-1361
DOI: 10.1587/transinf.2016PAP0018
Type of Manuscript: Special Section PAPER (Special Section on Parallel and Distributed Computing and Networking)
Category: Distributed system
peer-to-peer,  content distribution,  key-leakage resilience,  individualization,  multiple encryption,  

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Peer-to-peer (P2P) networks have attracted increasing attention in the distribution of large-volume and frequently accessed content. In this paper, we mainly consider the problem of key leakage in secure P2P content distribution. In secure content distribution, content is encrypted so that only legitimate users can access the content. Usually, users (peers) cannot be fully trusted in a P2P network because malicious ones might leak their decryption keys. If the redistribution of decryption keys occurs, copyright holders may incur great losses caused by free riders who access content without purchasing it. To decrease the damage caused by the key leakage, the individualization of encrypted content is necessary. The individualization means that a different (set of) decryption key(s) is required for each user to access content. In this paper, we propose a P2P content distribution scheme resilient to the key leakage that achieves the individualization of encrypted content. We show the feasibility of our scheme by conducting a large-scale P2P experiment in a real network.