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• OPC-10000-2 – OPC Unified Architecture - Part 2: Security Model
  4.3.2.2 Message flooding
  Server 's resources. For PubSub , an attacker can send a large volume of dataset messages with the goal of overwhelming the subscriber, the middleware or dependent components such ... Client - Server, PubSub message flooding attacks can use both well-formed and malformed Messages . For well-formed Messages , the attacker could be one in which the publisher
• OPC-10000-6 – OPC Unified Architecture - Part 6: Mappings
  6.7.7 Verifying Message Security
  This value may be 0 if the Message is an OpenSecureChannel request. For other Messages, it shall report a Bad_SecureChannelUnknown error if the SecureChannelId is not recognized ... encountered. Stacks that implement UASC shall have a mechanism to log errors when invalid Messages are discarded. This mechanism is intended for developers, systems integrators and administrators to debug network