Secure consolidation of charging information over Smart Grid using ID federation

In the current power system, a bill for electricity used through an outlet is not charged to a consumer but to the manager of the outlet. This research presents schemes in which the bill for electricity is charged to the consumer. Even if a consumer uses outlets at outside the home, all bills for the power consumption at home and the outside are consolidated in an electric utility the consumer contracts with. In this paper, we define security requirements and evaluate that the proposed schemes satisfy the requirements. We suppose the privacy for consumer and the accuracy of billing as the security requirements and use an identity federation and digital signatures to satisfy the requirements. We propose a basic scheme first, and improve the efficiency of the scheme. We prove that the number of verifications and computational complexity are reduced in the improved scheme.