Tech journalist, Kim Zetter: the world's first digital weapon

In 2010 the US was waging warfare against Iran over its nuclear programme through a computer virus that affected a uranium enrichment plant. Stuxnet was the world's first digital weapon which was designed to exploit certain industrial systems. In her book Countdown to Zero Day, technology and cybercrime journalist Kim Zetter explores how the Stuxnet virus was executed and discovered - and what it means for digital warfare and the targeting of vulnerable utility systems like nuclear plants, power grids and oil pipelines.