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

Jinguang Han; Willy Susilo; Yi Mu; Jianying Zhou; Man Ho Au

Paper 2014/470

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

Jinguang Han, Willy Susilo, Yi Mu, Jianying Zhou, and Man Ho Au

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

Metadata

Available format(s): PDF
Category: Public-key cryptography
Publication info: Published elsewhere. Minor revision. Full version of the ESORICS 2014 paper.
Keywords: CP-ABE decentralization privacy
Contact author(s): jghan22 @ gmail com
History: 2014-06-21: received
Short URL: https://ia.cr/2014/470
License: CC BY

BibTeX

@misc{cryptoeprint:2014/470,
      author = {Jinguang Han and Willy Susilo and Yi Mu and Jianying Zhou and Man Ho Au},
      title = {PPDCP-ABE: Privacy-Preserving Decentralized Cipher-Policy Attribute-Based Encryption},
      howpublished = {Cryptology ePrint Archive, Paper 2014/470},
      year = {2014},
      note = {\url{https://eprint.iacr.org/2014/470}},
      url = {https://eprint.iacr.org/2014/470}
}