Secure Data Sharing In Clouds

With the rapid rise and popularization of cloud computing technology,cloud storage serves as a basic function of cloud computing,providing storage space for data owners and providing convenient data access services.Data owners store data in the cloud for sharing with other users.However,when the data owner stores the data in the cloud,the security of the data will be considered,and the security sharing of the data is the ideal application scenario expected by the cloud.In this paper,a secure data sharing scheme in cloud environment is proposed,which realizes the sharing process of data ”one to many” between data owner and multiple authorized users through storage space provided by cloud,combined with AES symmetric encryption scheme,certificateless public key encryption scheme with verifiable public key and asymmetric encryption scheme based on polynomial.A secure sharing of data between the data owner and the authorized user is achieved.During the sharing process,the private key of the data owner and the authorized user is not leaked to either party,although it passes through the cloud,But the cloud can not know the private key of any user,so it can not get data from ciphertext.In addition,the scheme can efficiently and flexibly deal with the security sharing of data in the case of new user joining and user revocation.