  Critical infrastructure systems like power grid require an improved critical
in-formation infrastructure (CII) that can not only help in monitoring of the
crit-ical entities but also take part in failure analysis and self-healing.
Efficient designing of a CII is challenging as each kind of communication
technology has its own advantages and disadvantages. Wired networks are highly
scala-ble and secure, but they are neither cost effective nor dynamic in
nature. Wireless communication technologies on the other hand are easy to
deploy, low cost etc. but they are vulnerable to cyber-attacks. In order to
optimize cost, power consumption, dynamic nature, accuracy and scalability a
hybrid communication network is designed in this paper where a portion of the
communication network is built using wireless sensor networks (WSN) and the
rest is a wired network of fiber optic channels. To offer seamless opera-tion
of the hybrid communication network and provide security a Secure Smart Grid
Monitoring Technique (SSGMT) is also proposed. The perfor-mance of the proposed
hybrid CII for the generation and transmission sys-tem of power grid coupled
with the SSGMT during different cyber-attacks is tested using NS2 simulator.
The simulation results show that the SSGMT for a joint power communication
network of IEEE 118-Bus system performs better than the prevailing wireless
CIIs like Lo-ADI and Modified AODV.
