A key management-based two-level encryption method for AMI

In the key management-based security scheme of Advanced Metering Infrastructure (AMI), it is assumed that the established third party and the links between smart meter and the third party are fully trusted. But in wired/wireless communication, man-in-the middle can interfere, and the monitors and controls in the system can expose its vulnerability. Because of this, we propose a security scheme based on two independent and partially trusted but simple servers, which includes two-level encryption without increasing packet overhead. One server (master) manages the data encryption between the meter to ES (energy supplier) and the other server manages randomized data transfer. We also propose a simple node-to-node authentication method based on electromagnetic signal strength.