Abstract: As an important part of smart grid monitoring system，the security of power wide area measurement

system is very important. Therefore，in order to ensure the integrity and confidentiality of communication data in

power wide area measurement system and the communication security between terminal devices in the system，a

security authentication scheme of power wide area measurement system based on SM2 algorithm was proposed.

Mutual authentication based on SM2 algorithm and digital certificate technology was realized by the scheme，which

also improves the security and reliability of data communication between PMU devices in smart grid devices.

Finally，the security analysis and experimental evaluation show that man in the middle attack，replay attack，longtime eavesdropping and other attacks can be resisted effectively by the scheme.

      Key words: SM2（an elliptic curve public key cryptographic algorithm）；wide area measurement system

（WAMS）；phasor measurement uni（t PMU）；mutual authentication