Hsu et al. (2022) proposed a cryptographic scheme within the public key infrastructure to bolster the security of smart grid meters. Their proposal involved developing the Certificate Management over CMS mechanism to establish Simple Certificate Enrollment Protocol and Enrollment over Secure Transport protocol. Additionally, they implemented Online Certificate Status Protocol (OCSP) services to independently query the status of certificates. However, their implementation featured a single OCSP server handling all query requests. Considering the typical scenario in smart grid PKI environments with over tens of thousands of end-meters, we introduced a Hybrid Online Certificate Status Protocol mechanism. This approach decreases demand of query resources from the client to OCSP servers collaborating with Certificate Revocation Lists. Our simulations, mimicking meter behavior, demonstrated increased efficiency, creating a more robust architecture tailored to the smart grid meter landscape.

翻译：Hsu等人（2022）提出了一种在公钥基础设施内的密码学方案，以增强智能电网电表的安全性。他们的方案包括开发基于CMS的证书管理机制，以建立简单证书注册协议和安全传输注册协议。此外，他们实现了在线证书状态协议（OCSP）服务，用于独立查询证书状态。然而，其实施方案采用单一OCSP服务器处理所有查询请求。考虑到智能电网PKI环境中通常存在数以万计的终端电表，我们引入了一种混合在线证书状态协议机制。该方法通过结合证书吊销列表，降低了客户端对OCSP服务器的查询资源需求。我们模拟电表行为的仿真实验表明，该机制提高了效率，构建了更适应智能电网电表环境的鲁棒架构。