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Key-Policy Multi-authority Attribute-Based Encryption

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Algebraic Informatics (CAI 2015)

Part of the book series: Lecture Notes in Computer Science ((LNTCS,volume 9270))

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Abstract

Bilinear groups are often used to create Attribute-Based Encryption (ABE) algorithms. In particular, they have been used to create an ABE system with multi authorities, but limited to the ciphertext-policy instance. Here, for the first time, we propose a multi-authority key-policy ABE system.

In our proposal, the authorities may be set up in any moment and without any coordination. A party can simply act as an ABE authority by creating its own public parameters and issuing private keys to the users. A user can thus encrypt data choosing both a set of attributes and a set of trusted authorities, maintaining full control unless all his chosen authorities collude against him.

We prove our system secure under the bilinear Diffie-Hellman assumption.

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Author information

Authors and Affiliations

  1. Department of Mathematics, University of Trento, Via Sommarive, 14, 38123, Povo, Trento, Italy

    Riccardo Longo & Massimiliano Sala

  2. Department of Mathematics, University of Turin, Via Carlo Alberto, 10, 10123, Turin, Italy

    Chiara Marcolla

Authors
  1. Riccardo Longo
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  2. Chiara Marcolla
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  3. Massimiliano Sala
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Corresponding author

Correspondence to Riccardo Longo .

Editor information

Editors and Affiliations

  1. Institut für Maschinelle, Universität Stuttgart, Stuttgart, Baden-Württemberg, Germany

    Andreas Maletti

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Longo, R., Marcolla, C., Sala, M. (2015). Key-Policy Multi-authority Attribute-Based Encryption. In: Maletti, A. (eds) Algebraic Informatics. CAI 2015. Lecture Notes in Computer Science(), vol 9270. Springer, Cham. https://doi.org/10.1007/978-3-319-23021-4_14

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  • DOI: https://doi.org/10.1007/978-3-319-23021-4_14

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  • Publisher Name: Springer, Cham

  • Print ISBN: 978-3-319-23020-7

  • Online ISBN: 978-3-319-23021-4

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