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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.

Note: Updated as TR2008-617. You can find it here.

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   Patrick P. Tsang and Sean W. Smith, "YASIR: A Low-Latency, High-Integrity Security Retrofit for Legacy SCADA Systems." Dartmouth Computer Science Technical Report TR2007-603, September 2007.

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