Abstract
The Industrial Internet of Things (IIoT) gains importance in many domains including critical infrastructures. To provide the necessary quality of service, securing the IIoT is essential. A large critical infrastructure that uses the IIoT is the Smart Grid. The Smart Grid consists of many substations. Their orchestration heavily relies on group-communication.Secure group-communication relies on secure distribution and management of group keys: Group Key Management (GKM). As central task, GKM ensures that only authorized group members share the secret key. In the IIoT a common GKM protocol is Group Domain of Interpretation (GDOI).The GDOI standard currently provides only partial solutions for ensuring group-consistency during key-distribution and update. This paper proposes and evaluates a solution for the group consistency problem in PULL-based GDOI. The guiding scenario is substation automation but the results directly match other distributed infrastructures such as sensor networks.
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