Abstract
This project discusses security issues, countermeasures and research issues in the Supervisory Control And Data Acquisition (SCADA) system. SCADA system is used in power sector for controlling and monitoring industrial processes. The major components in the SCADA system are master terminal unit, remote terminal unit and the communication link connecting them. Protocols used in this communication link are DNP3 (Distributed Network Protocol version 3.0) and Modbus. Vulnerabilities in these components lie in policy, procedure, platform and protocols used. Countermeasures for these vulnerabilities are deployment of firewalls, intrusion detection system, wrapping protocols in secure layers, enhancing protocol structure etc. Some of these countermeasures do not provide complete security and hence requires more research. A number of issues that require more research are also recommended.