Cyber security is beyond just information security. Cyber security means the security of the entire control systems in a given sector for example the electricity grid or radar communications grid. SCADA applications typically are at the heart of all these systems. Most of these systems are legacy systems and dont work on IP. Proprietary control protocols like MODBUS , DNP are used. Control feedback Communication is typically over serial interfaces coupled to twisted pair , optical SONETS ,frame relays and ATMs. With the movement towards Smarter Grids, SCADA protocols are being increasingly tunneled over IP. Do vulnerabilities exist in these systems? Yes. But the knowledge and tools needed to exploit those are not very public.
The US ofcourse is a master at this as major control systems , PLC, RTU manufacturers are American eg. Johnson controls, GE. Siemens is a major non-US manufacturer. In India L&T, IMT etc are in this business.
Preceding the F117s and F15s bombing runs on Iraq , cyber attacks were launched on the Iraqi power and communications grids. Most of that grid was paralyzed and crippled even before the first smart bombs rained down and destroyed them.
The Indian Army has had a cyber security wing as part of the Signals Corp for many years now. The Indian Navy for example chose to develop its own secure encrypted communications and PKI infrastructure from the ground up and this was in the early 80s.
A good place to start looking at cyber security would be NIST CIP standards.For the script kiddies/noobs open source tools like Nessus have a SCADA plugin.