In the era of digital grid

information flow determines energy flow

and network security risks are increasingly prominent. The power IoT terminals with limited resources

as the end access nodes of the power grid

generally have weak security protection and are prone to becoming a springboard for hackers to attack the power grid. The security authentication of terminal devices is an important prerequisite for ensuring their secure access. However

the current mainstream security authentication mechanisms based on digital certificates have high resource requirements and cannot meet the lightweight and efficient authentication requirements of IoT terminals. This article proposes a certificate trustworthiness fast mapping algorithm based on a lightweight digital certificate structure using a distributed hash table and high-performance data caching design

based on domestically produced commercial cryptographic algorithms in China. Based on this

a lightweight digital certificate generation

application

verification

and revocation full process security authentication mechanism is designed to support large-scale terminal access. This not only significantly reduces the resource occupation of traditional digital certificates on devices

but also effectively improves the high concurrency security authentication efficiency of power IoT terminals. Based on the analysis of comprehensive simulation experiments and pilot verification results

the method proposed in this paper reduces the proportion of certificate storage resources by over 93% while ensuring compliance and effective implementation of terminal security access. The average time for certificate application

verification

and revocation is reduced by 8.3%

11.7%

and 6.2%

respectively. This method can effectively solve the problem of efficient security authentication for a large number of heterogeneous terminals

improve the security level of the power network

and support the high-quality development of China's digital power grid.