Instead of concentrating the cost prohibitive approach of trying to secure from the SCADA standpoint, more interest should be put into analyzing why these systems are accessible over the internet. Does each system really need to be accessed externally? If you put effective firewalls, password management, quotas and access controls on the web portal you won't have to worry about all of the internal workings. If you lock the front door to your home, there is no need to lock every interior door.
Systems such as these shouldn't be easier to hack than a facebook page.
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Instead of concentrating the cost prohibitive approach of trying to secure from the SCADA standpoint, more interest should be put into analyzing why these systems are accessible over the internet. Does each system really need to be accessed externally? If you put effective firewalls, password management, quotas and access controls on the web portal you won't have to worry about all of the internal workings. If you lock the front door to your home, there is no need to lock every interior door. Systems such as these shouldn't be easier to hack than a facebook page.