In the movie Die Hard 4, villain Thomas Gabriel used hackers to gain control of transport grids and the stock market and later plunged much of the US and Canadian eastern seaboard into darkness after taking control of the gas distribution system and redirecting all of the gas toward a utility superstation in West Virginia, causing it to explode.

Fortunately, the renowned John McClane was on the job and, together with the computer hacker Matt Farrell, was able to destroy Gabriel and his men – rescuing McClane’s hostage daughter in the process. When cyber-attacks on critical infrastructure happen in real life, however, we may not have an action hero…