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30 years ago, the idea that someone using a computer thousands of miles away

would be able to steal your life savings or collapse the NHS would have been seen as fanciful.

Not today, it's all too real.

Individuals, businesses and governments are being targeted online by criminals, home and abroad every few seconds.

And as upsetting as the thought of having your bank account emptied is,

it's probably not as scary as the prospect of a rogue nation seizing control of our energy grid or nuclear assets.

In the second of our three-part miniseries looking at how resilient the UK might be in dealing with potential future crises,

we ask how prepared are we to cope with these cyber threats?

Step inside the briefing room and together we'll

find out. Joining me in the briefing room to discuss all this are Emery Taylor, CEO of Oxford

Information Labs, Sadie Crease, Professor of Cybersecurity in the Department of Computer Science

at Oxford University,

and Dr. Ibas Tunstuan, reader in digital innovation and information security at King's College London.

Emily Taylor, the most basic of the basics. What is a cyber attack?

Well, funnily enough, there's not really an agreed definition of a cyber attack,

even though this is a term you hear bandied around all over the place.

But in most cases, it involves deliberate access to a computer system without authorization,

you know, with a malicious intent.

So there's an involvement of bypassing the controls, whether they be human controls or technical or physical controls.

A cyber attack takes different forms.

Can you just tell us the basic ones?

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