Key Policy Attribute-Based Proxy Re-encryption with Matrix Access Structure

Cloud computing has achieved rapid development. The cloud server even provides unlimited storage and powerful computing capability as services. A lot of attribute-based schemes have been constructed for cloud computing to come into practical applications. To our knowledge, there seems no flexible key policy attribute-based proxy re-encryption (KP-AB-PRE) scheme in the literature, which is a promising cryptographic primitive. In this paper, we propose a KP-ABPRE scheme, in which the cloud server can function as the proxy. In the proposed scheme, matrix access structure is used for the key policy. Furthermore, our construction enjoys the desirable properties of unidirectionality, non-interactivity, and multi-Use, and the secret key security is guaranteed.