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. © 2014 Springer International Publishing Switzerland.
CITATION STYLE
Han, J., Susilo, W., Mu, Y., Zhou, J., & Au, M. H. (2014). PPDCP-ABE: Privacy-preserving decentralized ciphertext-policy attribute-based encryption. In Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) (Vol. 8713 LNCS, pp. 73–90). Springer Verlag. https://doi.org/10.1007/978-3-319-11212-1_5
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