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Extra info for API Std 1164 SCADA Security, First Edition
The following sections will highlight the unique aspects of a SCADA communication system. 1 Field Device Technology Field devices provide the SCADA system with an interface to industrial devices that are designed to provide analog and status information from transducers and sensors. These signals are converted to digital values and transmitted upon request using various methods of telemetry. Commands are transmitted to the field devices and are processed in a similar manner. Certain classes of field devices such as PLCs, flow computers, engine/motor safety devices, and electrical equipment, provide specific functionality.
All employees, contractors, and visitors on company premises shall carry identification tags at all times. Lost cardkeys or equivalent access authorization device shall be reported within 24 hours to the applicable local security officer. Access shall be revoked immediately, in no case later than 24 hours, once the access is no longer needed. It is the responsibility of the immediate supervisor to see that cardkeys are retrieved and cancelled for terminated or transferred employees and contractors.
1 Intrusion Detection and Prevention Systems (IDPS) The operator should evaluate the use of the IDPS to monitor the behavior of network to identify events that may be considered unusual or undesirable. Methods to employ the IDPS include: — wireless, where wireless network traffic is examined for suspicious activity in the protocols; — behavioral or heuristic, where the network is examined for unusual traffic flow; — host monitoring, where a host computer is examined for suspicious activity (also referred to as HID—host intrusion detection).
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