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Privacy-preserving identity-based file sharing in smart city

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Abstract

People are experiencing an evolution of smart cities. Building a smart city will enhance economic competitiveness, social cohesion, and quality of life of its citizens. But smart cities accumulate and process large amount of files, which raises security and privacy concerns at individual and community levels. In the case of file sharing in smart cities, security should be considered to embrace file confidentiality, file integrity, receiver privacy, and sender privacy. In this paper, we propose a privacy-preserving identity-based file sharing (PIFS) scheme to meet these security goals. In PIFS, identity managers for receivers and senders designate them secret keys associated with their identities, respectively. Receivers and senders can register their identities to the group managers without leaking their secret keys. Then a sender can share confidential files with a peer, leaking neither identity of them. However, in case of dispute, the receiver group manager and sender open authority can trace the receiver and the sender, respectively. The security properties of our scheme are formally proven. Analysis shows that our scheme is efficient and practical.

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Acknowledgments

This paper is supported by the Natural Science Foundation of China through projects 61672083, 61370190, 61532021, 61472429, and 61402029, by the Beijing Natural Science Foundation through project 4132056.

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Authors and Affiliations

  1. School of Electronic and Information Engineering, Beihang University, No. 37, Xueyuan Road, Haidian District, Beijing, 100191, China

    Xiling Luo, Yili Ren & Qianhong Wu

  2. School of Engineering and IT, University of New South Wales, Sydney, Australia

    Jiankun Hu

  3. School of Information Engineering, Huzhou University, Huzhou, 313000, China

    Jungang Lou

Authors
  1. Xiling Luo
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  2. Yili Ren
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Correspondence to Qianhong Wu.

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Luo, X., Ren, Y., Hu, J. et al. Privacy-preserving identity-based file sharing in smart city. Pers Ubiquit Comput 21, 923–936 (2017). https://doi.org/10.1007/s00779-017-1051-z

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