Expressive, Efficient, and Revocable Data Access Control

for Multi-Authority Cloud Storage


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In this paper, we design an expressive,efficient and revocable data access control scheme for multi-authority cloud storage systems, where there are multiple authoritiesco-exist and each authority is able to issue attributes independently. Specifically, we propose a revocable multi-authority CP-ABEscheme, and apply it as the underlying techniques to design the data access control scheme.

Our attribute revocation methodcan efficiently achieve both forward security and backward security. The analysis and simulation results show that our proposed dataaccess control scheme is secure in the random oracle model and is more efficient than previous works.