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Customized Certificate Revocation Lists for IEEE 802.11s-Based Smart Grid AMI Networks

机译：基于IEEE 802.11s的智能网格AMI网络的自定义证书吊销列表

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Public-key cryptography (PKC) is widely used in smart grid (SG) communications to reduce the overhead of key management. However, PKC comes with its own problems in terms of certificate management. Specifically, certificate revocation lists (CRLs) need to be maintained and distributed to the smart meters (SMs) in order to ensure security of the communications. The size of CRLs may grow over time and eventually may introduce additional delay, bandwidth, and storage overhead when various applications are run on SG. In this paper, we propose novel algorithms for creating customized CRLs with reduced size for IEEE 802.11s-based advanced metering infrastructure (AMI) networks. Rather than maintaining a huge-size single CRL that introduces unnecessary search time and storage, the idea is to cluster/group SMs within the AMI network and create CRLs based on these groups. The grouping is mainly done in such a way that they bring together the SMs that will be very likely to communicate so that the CRLs will be kept local to that group. To this end, we propose two novel grouping algorithms. The first algorithm is a bottom-up approach, which is based on the existing routes from the SMs to the gateway. Since the SMs will be sending their data to the gateway through the nodes on the route, this forms a natural grouping. The second approach is a top-down recursive approach, which considers the minimum spanning tree of the network and then divides it into smaller subtrees. Via grouping, the length of the CRL for each SM and the corresponding distribution overhead can be reduced significantly. Simulation results have shown that our approach can maintain a balance between the size of the CRL and the number of signatures generated by CAs while guaranteeing security of the communications.
机译：公钥加密（PKC）广泛用于智能电网（SG）通信中，以减少密钥管理的开销。但是，PKC在证书管理方面有其自身的问题。具体而言，需要维护证书吊销列表（CRL）并将其分发给智能电表（SM），以确保通信的安全性。当各种应用程序在SG上运行时，CRL的大小可能会随时间增长，并最终会引入额外的延迟，带宽和存储开销。在本文中，我们提出了新颖的算法，用于为基于IEEE 802.11s的高级计量基础架构（AMI）网络创建尺寸减小的定制CRL。与其维护一个庞大的单一CRL（不引入不必要的搜索时间和存储空间），不如说是在AMI网络中对SM进行群集/分组并基于这些组创建CRL。分组的主要方式是将非常可能进行通信的SM聚集在一起，以便将CRL保留在该组的本地。为此，我们提出了两种新颖的分组算法。第一种算法是自下而上的方法，该方法基于从SM到网关的现有路由。由于SM将通过路由上的节点将其数据发送到网关，因此形成了自然的分组。第二种方法是自上而下的递归方法，它考虑网络的最小生成树，然后将其划分为较小的子树。通过分组，可以显着减少每个SM的CRL长度和相应的分发开销。仿真结果表明，我们的方法可以在CRL的大小和CA生成的签名数量之间保持平衡，同时保证通信的安全性。

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