ABSTRACT:
We construct a bump-in-the-wire (BITW) solution that retrofits security into time-critical communications over bandwidth-limited serial links between devices in Supervisory Control And Data Acquisition (SCADA) systems. Previous BITW solutions fail to provide the necessary security within timing constraints; the previous solution that does provide the necessary security is not BITW. At a comparable hardware cost, our BITW solution provides sufficient security, and yet incurs minimal end-to-end communication latency. A microcontroller prototype of our solution is under development.
INTRODUCTION
1.1 SCADA Systems
Supervisory Control And Data Acquisition (SCADA) systems are real-time process control systems that monitor and control local or geographically remote devices. They are widely used in modern industrial facilities and critical infrastructures, such as electric power generation and distribution systems, oil and gas refineries and transportation systems, allowing operators to ensure the proper functioning of these facilities and infrastructures.
Electric power utilities, for instance, were among the first to widely adopt remote monitoring and control systems. Their earliest SCADA systems provided simple monitoring through periodic sampling of analog data, but have evolved into more complex communication networks. In this pa- per, we focus on securing SCADA systems for electric power generation and distribution. However, our discussions and proposed solution are applicable to many other SCADA systems.
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Patrick P. Tsang† and Sean W. Smith‡
Department of Computer Science Dartmouth College NH 03755 USA
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