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• OPC-10000-1 – OPC Unified Architecture - Part 1: Overview and Concepts
  5.7.8 Security Key Service (SKS)
  publish or consume the secured messages. The SKS may be implemented directly by a Publisher, or it may be centralized where a single SKS is used by a group
• OPC-10000-81 – OPC Unified Architecture - Part 81: UAFX Connecting Devices and Information Model
  E.4.5 Autonomous publisher
  E.4.5 Autonomous publisher The Connection configuration for an autonomous Publisher contains the following configuration information (see Figure E.14 ): EndpointA, indicating OutputVariables; Flow1, describing the configuration for the information flow from ... EndpointA to one or more unknown Subscribers. For an autonomous publisher, no SubscriberConfiguration is required (see 6.13.3.2 ). Figure E.14 - Autonomous publisher illustration
• OPC-10000-81 – OPC Unified Architecture - Part 81: UAFX Connecting Devices and Information Model
  E.5 Interaction with an SKS
  configured SecurityGroups . The SKS can expose the SecurityGroups in its Information Model . A Publisher uses the current key to sign or sign and encrypt NetworkMessages , and Subscriber(s) to authenticate ... requested number of future keys are distributed from the SKS to the Publisher and the Subscriber(s) using the push or pull model. How past, current and future keys