摘要：SCADA netwo rk s and its proto co ls are developed based o n reliability , av ailability, and speed but withn o or little attentio n paid to secu rity. In p articular, SCADA n etwork us in g Mo dbu s p ro tocol is designed tob e in herently in secu re and vu lnerable to attacks . The lack of comm on security mech an isms in th e proto co ls uch as au th entication , co nfidentiality and integrity mu st b e ad dressed . In this p ap er, SCADA n etwo rksin secu rity will b e studied th ro ugh secu rity ex ploitation an d mo nitoring. A detailed analysis o f th e Mod busp ro tocol m es sag e frame formats b ein g s en t between master and slav e will be discussed to ex pose thein secu rities b y d esig n. Th is will enable SCADA users to find way s to fix the security flaws of the p roto co lan d design mitigation strategies to reduce the impact of the po ssible attacks . This p ap er will also provid es ecurity m ech an isms o n h ow to protect the SCADA critical in frastructures
