A novel attribute-based signcryption scheme in cloud computing environments

In this paper, a novel decentralized key-policy attribute-based signcryption scheme is proposed, where the decentralized authority A can generate an attribute-based key pair for the sensitive data owner independently. In the proposed scheme, the sensitive data owner can share sensitive data through specifying an attribute-based access control structure so that any users whose attributes satisfy it can be allowed to access the sensitive data without knowing the sensitive data owner's unique identity information. Therefore, it is clear that the decentralized authority can reduce the communication cost and the collaborative cost. Additionally, the decentralized key-policy attribute-based signcryption scheme is efficient in terms of both the security communication and identification authentication, and can realize security sensitive data sharing for valid users in cloud computing environments.