Analysis of Challenge-Response Authentication in a Networked Control System

Analysis of authentication time in challenge-response protocol has been presented here. The protocol has been used in a prototype Networked Control System (NCS) with multiple Plant Control Units (PCU) and Supervisory Control Unit (SCU). The units are programmed in IEC 61131-3 compliant CPDev (Control Program Developer) environment. Global variable manager is used to share common data across the network. The paper presents theoretical estimation of the handshake time during authentication between SCU and PCU. Experiments have been carried out to compare the estimations with a real application.

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