A Lightweight Secure Access Protocol for Collecting Terminals in Power Internet of Things Based on Symmetric Cryptographic Algorithm

In the development of Power Internet of Things, the types and number of terminals accessing to the power grid information network are growing rapidly, and the demand for identity authentication for master station and terminal is also increasing. This paper analyzes the characteristics and security access requirements of Power Internet of Things, then designs a security access protocol based on symmetric cryptographic algorithm for meters with limited manufacturing cost, computing power and storage resources. This protocol only uses the symmetric cipher algorithm with high computing speed and low resource consumption, which can realize the two-way identity authentication between the meter and the master station and update the session key for meter and master station based on the random initial value of the counter to establish a secure transmission channel. Finally, compared with other protocols, the proposed protocol is also effective in security and performance.