Research On Access Control Based On CP-ABE With Multi-authorties In Cloud Environment

With the rapid development of cloud computing,data sharing and data dealing are particularly important in an open environment.The owner not only design a flexible access control scheme,but also ensure confidentiality of the data between the users when uploading data between the users when uploading data.The prosposed scheme based on the attrubute encrytion(ABE)can solve the above problems.This paper mainly studies the multi-authorization mechanism and attribute weight of ABE.The main work is as follows:The existing Ciphertext-Policy ABE(CP-ABE)only supports single authorization center,but the single authorization center has low load and low fault tolerance in the cloud environment.To solve these problems,this paper designs A multi-CA system suitable for cloud environments.The multi-CA in the solution adopts a hierarchical structure.In the structure,there are multiple sub-hybrid CAs under one root CA,extending from the top layer to the bottom.This design not only facilitates management,but also solves the single point failure of a single CA in the attribute encryption scheme.Aiming at the problem of rarely considering attribute weight in traditional encryption schemes based on ciphertext-policy attribute-based encryption scheme,Based on the multi-hybrid CA in the cloud environment proposed in this paper,attribute weights are introduced,and a multi-center access control scheme based on CP-ABE weight attributes in a cloud environment is proposed,and this paper gives the algorithm scheme and system solutions.The paper ensure the safety of system,and analyzes the scheme theoretically.This scheme has more practical significance.