In power Internet of Things environment, the existing border-based protection system and the “one-time authentication, one-time authorization, and long-term effective” approach are difficult to deal with the threat of attacks from internal and external devices and users with legal authority. In order to solve the problem of authorized access of power equipment and users, combined with behavior risk assessment, a continuous trust evaluation scheme of power equipment and users is presented in this paper. The scheme is evaluated by the combination of direct trust, indirect trust, and comprehensive trust and adds the penalty reward factor and time attenuation function to improve the reliability of the results. In addition, this paper will quantify the risk of the behavior of power equipment and users and regard it as a factor affecting the degree of trust, so as to achieve continuous trust evaluation of equipment and users.

中文翻译：

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基于风险度量的电力设备和用户持续信任评估

在电力物联网环境中，现有的边界防护体系和“一次认证、一次授权、长效”的方式难以应对来自内外设备和用户的攻击威胁具有法律权限。为了解决电力设备和用户的授权访问问题，结合行为风险评估，提出了一种电力设备和用户的持续信任评估方案。该方案通过直接信任、间接信任和综合信任相结合的方式进行评估，并增加了惩罚奖励因子和时间衰减函数，提高了结果的可靠性。此外，