A practical provider authentication system for bidirectional broadcast service

Authors:
Takahiro Matsuda;Goichiro Hanaoka;Kanta Matsuura;Hideki Imai
Affiliations:
Institute of Industrial Science, The University of Tokyo, Tokyo, Japan;Research Center for Information Security, National Institute of Advanced Industrial Science and Technology, Tokyo, Japan;Institute of Industrial Science, The University of Tokyo, Tokyo, Japan;Research Center for Information Security, National Institute of Advanced Industrial Science and Technology, Tokyo, Japan and Faculty of Science and Engineering, Chuo University, Tokyo, Japan
Venue:
KES'07/WIRN'07 Proceedings of the 11th international conference, KES 2007 and XVII Italian workshop on neural networks conference on Knowledge-based intelligent information and engineering systems: Part III
Year:
2007

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Abstract

Several content distribution services via the Internet have been developed, and a number of bidirectional broadcasting services will be provided in the near future. Since such bidirectional broadcasting treats personal information of the users, provider authentication is necessary. Taking the currently existing broadcasting system using CAS cards into account, Ohtake et al. recently proposed the provider authentication system which utilizes key-insulated signature (KIS) schemes. However, the authors did not refer to details of what kind of KIS should be used. In this paper we supplement their works in terms of KIS specification. We carefully identify what kind of KIS should be used and propose concrete KIS schemes which realize both the reliability and the robustness required for the bidirectional broadcasting service.