The various pieces of technology that are in our lives could hand over our most personal information to hackers, the UK's most elite cyber security chiefs have warned.

Smart phones, watches, televisions, and fitness trackers all collect information on their users that could be used to extort money from people or pose as them.

An increasing amount of internet-connected deivces around the home allow hackers far more power to use "aggressive" and "confrontational" tactics, according to a new report from the Cyber Security Centre (NCSC) and the National Crime Agency (NCA).

It highlights the huge amount of personal information that those gadgets contain. Each of them has data including people's photos, personal messages and fitness information – which could be turned on their owners, according to the experts.

And it comes just days after WikiLeaks warned that phones and smart TVs could be used by the CIA and other agencies to spy on their owners.

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The study forecasts that this year it is likely that "ransomware" will target connected devices containing data such as photos, emails and even fitness progress information.

"This data may not be inherently valuable, and might not be sold on criminal forums but the device and data will be sufficiently valuable to the victim that they will be willing to pay for it," the assessment says.

"Ransomware on connected watches, fitness trackers and TVs will present a challenge to manufacturers, and it is not yet known whether customer support will extend to assisting with unlocking devices and providing advice on whether to pay a ransom."

A surge in the number and variety of internet-ready products has sparked a string of security warnings.

There have even been suggestions that baby monitors and pacemakers could be vulnerable to hacking.

Analysts have forecast that by 2020 there will be as many as 21 billion connected devices used by businesses and consumers around the world.

The NCSC and NCA's 2016/17 report on the cyber threat to UK business says: "The rise of internet connected devices gives attackers more opportunity."

The paper notes that smart devices are still "inherently more difficult" to attack than traditional computers, saying that incidents may initially be limited to users who download apps from third-party app stores.

Ministers launched the NCSC, which is part of GCHQ, amid mounting concern over the potential danger to Britain's industry and infrastructure from online attacks.

The new report says the cyber threat to UK business is "significant and growing".

In three months after the centre was created, there were 188 "high-level" attacks as well as "countless" lower-level incidents.

The danger is "varied and adaptable", ranging from high-volume, opportunistic attacks to "highly sophisticated" and persistent threats.

The last year "has been punctuated by cyber attacks on a scale and boldness not seen before", the report says, pointing to a string of incidents including the targeting of the US Democratic Party and Bangladesh Bank.

Ciaran Martin, chief executive of the NCSC, said: "Cyber attacks will continue to evolve, which is why the public and private sectors must continue to work at pace to deliver real-world outcomes and ground-breaking innovation to reduce the threat to critical services and to deter would-be attackers."

The report will be published on Tuesday as the NCSC hosts a major conference on cyber security in Liverpool.

It also says that there is no clear understanding of the true scale and cost of cyber attacks to the UK as it is under-reported.

Donald Toon, director for economic and cyber crime at the NCA, said: "Businesses reporting cyber crime is essential if we are to fully understand the threat, and take the most effective action against it."