关键词: 密文属性基加密（CP-ABE）, 属性撤销键, 逻辑二叉树, 多授权中心

Abstract: In order to solve the problem of security and attribute revocation caused by which directly introduce the CP-ABE scheme into the cloud access control. This paper proposes a multi authority attribute revocation scheme（RMCP-ABE）, through the use of logic two binary trees and each attribute of proxy reencryption methods to ensure the security attributes revocation process, flexibility and fine granularity of attribute revocation, and reduce the computational overhead of the data. The scheme introduces a multi authorization center model to avoid the threat of the authorization center being broken or collusion, and improves the operation efficiency. The security analysis and experimental analysis show that the security of the scheme is consistent with the traditional CP-ABE algorithm, and the cost is lower than that of other attribute revocation schemes.

Key words: Ciphertext-Policy Attribute-Based Encryption（CP-ABE）, attribute revocation, logical binary tree, multiple authorization centers