By analyzing the electricity usage data collected from users in a smart grid, the grid provider can flexibly adjust the power distribution policy. In such a setting, it is also important to ensure the confidentiality of users’ electricity usage data and the privacy of users. In this paper, we propose an efficient scheme for a smart grid that achieves lightweight aggregation, based on a novel symmetric homomorphic encryption scheme. In addition, we design an authentication agreement scheme that builds upon the password authenticated key exchange (PAKE) protocol. Our security analysis demonstrates that our proposed scheme guarantees the confidentiality and integrity of electricity usage data, as well as the privacy of users. Evaluation of the performance of our proposed scheme also demonstrates that we achieve efficient data aggregation, with only minimal computational overhead generated at the smart meter. A comparative summary of our proposed scheme with three other schemes shows that our proposed scheme is more secure and efficient.

通过分析从智能电网中的用户收集的用电量数据，电网提供商可以灵活地调整配电策略。在这种情况下，确保用户用电数据的机密性和用户隐私也很重要。在本文中，我们基于一种新颖的对称同态加密方案，为实现轻量级聚合的智能电网提出了一种有效的方案。此外，我们设计了一个基于密码认证密钥交换（PAKE）协议的认证协议方案。我们的安全性分析表明，我们提出的方案可保证用电量数据的机密性和完整性以及用户的隐私。对我们提出的方案的性能进行评估还表明，我们实现了有效的数据聚合，智能电表仅产生最小的计算开销。对我们提出的方案与其他三个方案的比较总结表明，我们提出的方案更加安全有效。