Identity and Policy Based Signcryption Scheme for AMI Downlink Transmission

The smart grid is an upgraded power network that integrates advanced metering infrastructure to provide seamless two-way communication between consumers and suppliers. Many researchers have proposed solutions to confidentiality, integrity, and authenticity in uplink transmission, but there are few pieces of literature on the security of downlink multicast communication. In this paper, we first introduce a new cryptographic concept called identity and policy based signcryption (IPSC) scheme. Then we give a concrete IPSC scheme, and prove the proposed scheme is IND-CPA secure under the DBDH assumption and UF-CMIA secure under the ECDL assumption. Finally, we present a secure and efficient smart grid downlink transmission framework by exploiting our IPSC scheme, which can ensure origin non-repudiation, data confidentiality and integrity, and can also provide fine-grained access control on downlink multicast information.