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• OPC-10000-2 – OPC Unified Architecture - Part 2: Security Model
  4.3.2.1 Overview
  Denial of service is the prevention of authorized access to a system resource or the delaying of system operations and functions. This can occur from a number of different attack ... message flooding, resource exhaustion and application crashes. Each of these are described separately. Denial of Service impacts Availability . See 5.1.2 for the reconciliation of this threat