SM7 Authentication Key Distribution Algorithm for Power Field Operation Intelligent Terminal

For the limited storage, computing and communication resources of power field operation intelligent terminal, most of the existing key management algorithms of SM7 focus on reducing node power consumption, resulting in the limited performance of terminal security and anti-capture. In order to ensure the operation performance of job terminal nodes and improve the ability to resist physical capture attacks, a lightweight SM7 authentication key management scheme is proposed. Through the deployment of concentrator nodes, the central area of control is added to form a new double-layer grid deployment model. Based on the new structure, a two-stage key information distribution algorithm is proposed. In each stage, the security threshold of Blom matrix space is set according to the number of nodes in each sub area, which greatly improves the network connectivity and anti-capture performance of power field operation information. The simulation results show that when the proportion of captured terminals is 5.4%, and the communication link failure probability of this scheme is 62% and 67% lower than that of t-UPK and SPECC schemes.