YASIR: A low-latency, high-integrity security retrofit for legacy SCADA systems

Abstract

We construct a bump-in-the-wire (BITW) solution that retro.ts security into time-critical communications over bandwidth-limited serial links between devices in legacy Supervisory Control And Data Acquisition (SCADA) systems, on which the proper operations of critical infrastructures such as the electric power grid rely. Previous BITW solutions do not provide the necessary security within timing constraints; the previous solution that does is not BITW. At a hardware cost comparable to existing solutions, our BITW solution provides suf.cient security, and yet incurs minimal end-to-end communication latency. © 2008 Springer Science+Business Media, LLC.