Article in: EngineerIT Magazine, January 2012
OPC, originally called OLE for process control, is used extensively in control systems to provide interoperability between devices and software from different vendors.
In this article, Gary Friend of Extech Safety Systems provides a summary of the security issues related to OPC, and shows how an OPC enforcer can be used to protect OPC servers and clients.
Gary Friend; "Protecting OPC Servers", EngineerIT Magazine, EE Publishers, January 2012