YASIR: A Low-Latency, High-Integrity Security Retrofit for Legacy SCADA Systems pdfauthor

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. ∗This work was supported in part by the National Science Foundation, under grant CNS-0524695, the U.S. Department of Homeland Security under Grant Award Number 2006-CS-001-000001, and the Institute for Security Technology Studies, under Grant number 2005-DD-BX-1091 awarded by the Bureau of Justice Assistance. The views and conclusions do not necessarily represent those of the sponsors. †[email protected] ‡[email protected]