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Key Management for Versatile Pay-TV Services

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Security and Trust Management (STM 2017)

Part of the book series: Lecture Notes in Computer Science ((LNSC,volume 10547))

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Abstract

The content of pay-TV services is encrypted and each subscriber has a security module that holds a decryption key. When subscribers want to receive the same pay-TV services that they receive at home outside their homes, they have to bring the security module with them. However, it is not easy to take the module out of the TV set. To enrich current and conventional pay-TV services and to make it easier for subscribers to obtain pay-TV services outside their homes, we propose a key management system using a temporary key, an attribute-based encryption (ABE) scheme, and a mobile terminal. The temporary key is not a conventional key, but has a backward compatibility. The ABE is used to restrict the time and location when and where the temporary key can be used. The mobile terminal has a role to take secret data related to the temporary key and ABE. In this system, a certain decryption key \(sk_t\) is stored in the mobile terminal. \(sk_t\) is used to decrypt a content key. Since \(sk_t\) is stored in a mobile terminal, it is vulnerable to being leaked. To protect services from such key leakage, we add a function to control when and where \(sk_t\) can be used. To introduce such a restriction, we employ an ABE scheme. The system uses ABE to exchange certain secret data between broadcasters and subscribers through communication networks. This key management system is secure against key leakage and enables subscribers obtain pay-TV services their homes.

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Acknowledgment

A part of this work is supported by JST CREST grant number JPMJCR1688.

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Authors and Affiliations

  1. Japan Broadcasting Corporation, Tokyo, Japan

    Kazuto Ogawa

  2. NTT Secure Platform Laboratories, Tokyo, Japan

    Sakurako Tamura

  3. National Institute of Advanced Industrial Science and Technology, Tokyo, Japan

    Goichiro Hanaoka

Authors
  1. Kazuto Ogawa
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  2. Sakurako Tamura
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  3. Goichiro Hanaoka
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Corresponding author

Correspondence to Kazuto Ogawa .

Editor information

Editors and Affiliations

  1. Università degli Studi di Milano, Crema, Italy

    Giovanni Livraga

  2. University of London, Egham, United Kingdom

    Chris Mitchell

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Ogawa, K., Tamura, S., Hanaoka, G. (2017). Key Management for Versatile Pay-TV Services. In: Livraga, G., Mitchell, C. (eds) Security and Trust Management. STM 2017. Lecture Notes in Computer Science(), vol 10547. Springer, Cham. https://doi.org/10.1007/978-3-319-68063-7_1

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  • DOI: https://doi.org/10.1007/978-3-319-68063-7_1

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