A proposed architecture for SCADA network security

Nowadays security plays the major role in the network. Growing size of such proprietary networks creates increased opportunity for successful attack. Supervisory control and data-acquisition (SCADA) networks are more secure and vulnerable to attach from both internal and external intruders. It is the mechanism which is used to provide continuous monitoring and authentication to the network. Authentication provided for the individual users and the nodes. Data collected from the various wireless sensor nodes. Active mode of operation is used to block the unauthorized nodes. After that the packets are given to the main system. MD5 (Message-Digest algorithm 5) is a widely used cryptographic hash function with a 128-bit hash value which is used to verify the packets. The packets may be the normal or malicious packets. Normal packets are given to the overall network. The malicious packets are given to the sink node for finding the compromised node in the network.