Security Measures in SCADA Systems

In the past few years the security issues in the supervisory control and data acquisition (SCADA) system have been widely investigated, and many security mechanisms have been proposed from research communities. The international standard organizations also have published several standard documents for secured SCADA systems. In this paper, we overview the SCADA system architecture and consider the constraints due to the systems own characteristics. And then, we explain the technological challenges for the SCADA security and summarize the current results which have been brought out by the efforts from the international bodies as well as research communities.