chicksdaddy writes "The Security Ledger has picked up on an opinion piece by noted cyber terrorism and Stuxnet expert Ralph Langner (@langnergroup) who argues in a blog post that critical infrastructure owners should consider implementing what he calls 'analog hard stops' to cyber attacks. Langner cautions against the wholesale embrace of digital systems by stating the obvious: that 'every digital system has a vulnerability,' and that it's nearly impossible to rule out the possibility that potentially harmful vulnerabilities won't be discovered during the design and testing phase of a digital ICS product. ... For example, many nuclear power plants still rely on what is considered 'outdated' analog reactor protection systems. While that is a concern (maintaining those systems and finding engineers to operate them is increasingly difficult), the analog protection systems have one big advantage over their digital successors: they are immune against cyber attacks.
Rather than bowing to the inevitability of the digital revolution, the U.S. Government (and others) could offer support for (or at least openness to) analog components as a backstop to advanced cyber attacks could create the financial incentive for aging systems to be maintained and the engineering talent to run them to be nurtured, Langner suggests." Or maybe you could isolate control systems from the Internet.