Cyber war: new lessons from history?

The idea of cyber war is not new; researchers first suggested the concept 30 years ago.

Since then, there's been a debate on what cyber war means and what can be done to prevent it.

Some experts even suggest cyber war is already happening, even if it is mostly in the shadows.

For Peter Kestner, the rise of cyber attacks and an increasingly volatile geopolitical situation were just two of the reasons to examine cyber warfare in more detail.

Peter is both a keen student of history, and a cybersecurity professional with over 25 years' experience in consulting in the sector.

He decided to combine the two interests, and the result is his new book, "The Art of Cyber Warfare".

Peter believes that by looking into conflicts in the past, we can learn valuable lessons about how warfare, and especially cyber warfare, might develop. But history can also teach us how to improve our defences, against adversaries who are as comfortable attacking civilian as government or military targets.

• Please note this episode contains some stronger than usual language.