PPDCP-ABE: Privacy-Preserving Decentralized Ciphertext-Policy Attribute-Based Encryption

  • Jinguang Han
  • Willy Susilo
  • Yi Mu
  • Jianying Zhou
  • Man Ho Au
Conference paper

DOI: 10.1007/978-3-319-11212-1_5

Part of the Lecture Notes in Computer Science book series (LNCS, volume 8713)
Cite this paper as:
Han J., Susilo W., Mu Y., Zhou J., Au M.H. (2014) PPDCP-ABE: Privacy-Preserving Decentralized Ciphertext-Policy Attribute-Based Encryption. In: Kutyłowski M., Vaidya J. (eds) Computer Security - ESORICS 2014. ESORICS 2014. Lecture Notes in Computer Science, vol 8713. Springer, Cham

Abstract

Cipher-policy attribute-based encryption (CP-ABE) is a more efficient and flexible encryption system as the encryptor can control the access structure when encrypting a message. In this paper, we propose a privacy-preserving decentralized CP-ABE (PPDCP-ABE) scheme where the central authority is not required, namely each authority can work independently without the cooperation to initialize the system. Meanwhile, a user can obtain secret keys from multiple authorities without releasing his global identifier (GID) and attributes to them. This is contrasted to the previous privacy-preserving multi-authority ABE (PPMA-ABE) schemes where a user can obtain secret keys from multiple authorities with them knowing his attributes and a central authority is required. However, some sensitive attributes can also release the user’s identity information. Hence, contemporary PPMA-ABE schemes cannot fully protect users’ privacy as multiple authorities can cooperate to identifier a user by collecting and analyzing his attributes. Therefore, it remains a challenging and important work to construct a PPMA-ABE scheme where the central authority is not required and both the identifiers and the attributes are considered.

Keywords

CP-ABE decentralization privacy 

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Copyright information

© Springer International Publishing Switzerland 2014

Authors and Affiliations

  • Jinguang Han
    • 1
  • Willy Susilo
    • 2
  • Yi Mu
    • 2
  • Jianying Zhou
    • 3
  • Man Ho Au
    • 2
  1. 1.Jiangsu Provincial Key Laboratory of E-BusinessNanjing University of Finance and EconomicsNanjingChina
  2. 2.School of Computer Science and Software EngineeringUniversity of WollongongWollongongAustralia
  3. 3.Infocomm Security DepartmentInstitute for Infocomm ResearchSingaporeSingapore

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