BIB-VERSION:: CS-TR-v2.0 ID:: ncstrl.dartmouthcs//TR2007-603 ENTRY:: September 25, 2007 ORGANIZATION:: Dartmouth College, Computer Science TITLE:: YASIR: A Low-Latency, High-Integrity Security Retrofit for Legacy SCADA Systems TYPE:: Technical Report (paper) REVISION:: 1 AUTHOR:: Tsang, Patrick P. AUTHOR:: Smith, Sean W. DATE:: September 2007 RETRIEVAL:: For a paper copy, email RETRIEVAL:: For a paper copy, write to Technical Report Librarian Department of Computer Science Dartmouth College 6211 Sudikoff Laboratory Hanover, NH 03755-3510 USA RETRIEVAL:: PDF at http://www.cs.dartmouth.edu/reports/TR2007-603.pdf 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. END:: ncstrl.dartmouthcs//TR2007-603