关键词: 属性基加密, 多授权机构, 叛徒撤销, 完全子树架构

Abstract: Due to the key-abuse problem in the single authority attribute-based encryption, as well as the efficiency and security issues because of the encryption mechanism, this paper studies a multi-authority attribute-based encryption which can implement the revocation of unauthorized users（or traitors）. Using bilinear mapping and linear secret sharing scheme to implement the interaction of multiple authorities without the need for a central authority, as well as combing with the complete subtree structure to map the users to a binary tree for efficiency improvement of traitor revocation, the paper transfers a single authority scheme into a multi-authority attribute-based encryption scheme for traitor revocation called MA-TRABE. It also analyzes the security under collusion attack and multi-authority circumstances. According to the needs of security payment in the e-commerce, the practical application of MA-TRABE is designed.

Key words: attribute-based encryption, multi-authority, traitor verocation, complete subtree structure