Enabling Constraints and Dynamic Preventive Access Control Policy Enforcement in the Cloud

Existing access control solutions applying Cipher text Policy Attribute based Encryption (CP-ABE) scheme usually rely on the static access enforcement based on the access control policy. In real-world scenario, the static pattern of access control policy may not be sufficient to effectively respond the security problems or advanced access control requirements. In this paper, we enhance our collaborative access control model: C-CP-ARBE, to be capable to support a more rigorous access control with security constraints and preventive access policy (PAP) enforcement feature. To this end, we design constraints specification model and PAP enforcement scheme in multi-authority cloud storage systems. We employ Multi-Agent System (MAS) to automate the authentication and authorization function as well as to increase the performance of overall cryptographic processes. As of MAS concept, the scalability and separation of security functions of our access control system are enhanced. Finally, we present the experiments to demonstrate the improved efficiency and practicality of our proposed scheme.