Achieve distributed, scalable and effective access control in cloud storage services

摘要

Cloud storage services enable users to remotely store their data and conveniently share their information. One critical issue is how to achieve data security and realize data access policy in cloud storage services. Existing schemes based on Ciphertext-Policy Attribute-Based Encryption (CP-ABE) have been proposed to achieve secure access control for outsourced data in cloud computing. However, due to the inefficiency of decryption and the inflexibility, most of these schemes are not suitable to realize distributed access control for cloud storage systems. In this paper, we propose a fully distributed, scalable and effective data access control scheme to encrypt and decrypt data, which bases on the lowest density maximum distance separable (LD-MDS) code.The introduction of the LD-MDS code in this field improves performance greatly in decryption stage. Security analysis indicates that the proposed scheme is secure and achieves fine-grained access control, collusion resistant, backward security and forward security simultaneously. Extensive performance analysis and experiment show that our scheme is much more efficient than existing CP-ABE system in cloud storage services.