Design And Implementation Of Attribute-based Encryption Scheme In Hybrid Clouds

As a new and efficient computing model,cloud computing has been widely concerned and applied in recent years.Cloud computing with service outsourcing,resource rent and application hosting as its core,to provide convenient services for enterprises and individual users,has hight reliability,economical and practical,easy to operate and so on.Cloud storage as a cloud application model for enterprise and individuals users to provide data storage services,is widely used in cloud.computing services.However,cloud computing potential security problems caused some bad influence to the businesses and individuals in recent years,cloud security issues have had a profound impact on the lives of people,enterprises and research institutions to solve the problem.This thesis first introduces the development,characteristics and security issues of cloud computing.Then the classification and methods of traditional access control are introduced,and the disadvantages are pointed out,which leads to access control under cloud environment.On this basis,an improved ciphertext-policy attribute-based encryption(CP-ABE)is proposed,which has better decryption performance.At the same time,the concept,classification and characteristics of current cloud storage technology are introduced.Focusing on the issue that inefficient data security and access control in the existed cloud storage,which result in sensitive information be stolen.Combined with the existed CP-ABE and data partition,a hybrid cloud storage scheme was proposed.First,the data is divided into multiple data blocks,the metadata is encrypted using CP-ABE algorithm and stored in the private cloud,the general blocks are stored in a public cloud environment using symmetric encryption.Finally,the storage schema is implemented and test.The experimental results show that better ensure the security and integrity of the data.