University of Wollongong
"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, the authors 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 the users' 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 their attributes and a central authority is required."