A group authenticated key agreement protocol for secure communication between distributed power terminal devices

In order to combat climate change and energy shortage, countries around the world are actively developing new energy sources represented by photovoltaic (PV) power generation, thereby accelerating the green and low-carbon transformation of the energy system. With the maturity of photovoltaic technology and the expansion of the application scale, distributed photovoltaic power system faces the problem of secure communication in the actual situation of decentralized power terminal devices. Existing group authenticated key agreement protocols lack efficient session key construction with flexible group composition based on broadcast channels in distributed scenarios. So to solve the above problem, we propose a group authenticated key agreement protocol from bivariate polynomial based secret sharing and BLS based multi-signature . This protocol achieves authentication of group members and signature authentication of protocol interaction messages through BLS multisignature. The protocol builds symmetric key between session members point-to-point and session key seed reconstruction by bivariate polynomial. Our proposed protocol supports secure communication of arbitrary session members in the set of group members without containing public key encryption. Finally, we formally proof the security of the session keys in the static standard security model and forward secrecy security of the proposed protocol. A comprehensive analysis of the attributes and performance of the proposed protocol is also presented.