Every government fears the hostile takeover of key infrastructure like transport systems or power stations. But governments themselves are believed to target other nations to search for intelligence, information and data that might be useful.
With experts now saying that security breaches are inevitable, the question is how to minimise the danger and the damage. BBC Click’s Dan Simmons visits a major cyber-security company to look behind the scenes at how state-sponsored hacking can be prevented.
See also: Cyber Pearl Harbor: Why hasn’t a mega attack happened?
If you would like to comment on this video or anything else you have seen on Future, head over to our Facebook page or message us on Twitter.
You can also find the Click team on Facebook or at @BBCClick