The news that the satirical movie—which revolves around a plot to murder Kim Jong-Un—will have a Christmas Day release as planned, will prompt renewed scrutiny of whether, as the US authorities have officially claimed, the cyber attack on Sony really was the work of an elite group of North Korean government hackers.

All the evidence leads me to believe that the great Sony Pictures hack of 2014 is far more likely to be the work of one disgruntled employee facing a pink slip.

I may be biased, but, as the director of security operations for DEF CON, the world's largest hacker conference, and the principal security researcher for the world's leading mobile security company, Cloudflare, I think I am worth hearing out.

The FBI was very clear in its press release about who it believed was responsible for the attack: "The FBI now has enough information to conclude that the North Korean government is responsible for these actions," they said in their December 19 statement, before adding, "the need to protect sensitive sources and methods precludes us from sharing all of this information".