Novel Secure Privacy-Preserving Decentralized Attribute-Based Encryption

Decentralized attribute-based encryption (DABE) is an efficient multi-authority attribute-based encryption system. But most of the available are shown there are security vulnerabilities. How to construct secure DABE is still a challenging problem at present. In this paper, based on Lewko and Waters’s scheme, a decentralized attribute-based encryption with preserving the privacy of the identifies and attributes in access structure is proposed. The presented scheme keeps the security of the original one and removes the random oracle. In addition, the proposed scheme achieves the user collusion avoidance. Finally, we show that the security of the proposed scheme is reduced to static assumptions based on dual system encryption instead of other strong assumptions.