YOUR watch knows too much.

Especially if it’s a smart watch with motion sensors.

These monitor your hand’s every movement. With incredible detail.

And researchers have already come up with computer algorithms that can recognise the tiny differences in movement when you chose — and move — your fingers to different numbers on a keypad.

A team from Stevens Institute of Technology was able to crack ATM PINs with an accuracy rate of 90 per cent as early as 2016.

But things have only gotten easier as smart watches get more sophisticated and sensitive, warns Russia-based digital security firm Kaspersky.

It’s issued a new warning that your smart watch is the ultimate Trojan Horse.

And it says it can now steal your complex computer password with 96 per cent accuracy.

Kaspersky should know. It’s been implicated in Kremlin spying operations.

EYES ON YOUR WRIST
Smart watch built-in accelerometers and gyroscopes covertly record your every move.

Their manufacturers openly advertise how it can tell you how active you’ve been. It can even tell you how healthy your heart is.

But that’s just the tip of the iceberg of such intimate data sensed.

And that data, in the wrong hands and filtered by the right algorithm, can reveal much, much more about you.

It enables hackers, corporations and marketers to build up a comprehensive profile of your every habit.

Have a passcode to access your phone or tablet? Your watch knows it.

Have difficulty remembering which PIN applies to which card? Your watch records them all.

Have a high-security password for your computer or workplace? Yep, that’s been sensed as well.

But it also reveals what you are doing — real time.

“The data can indeed be used to work out if the wearer is walking or sitting,” the Kaspersky report says. “Moreover, it’s possible to dig deeper and figure out if the person is out for a stroll or changing subway trains — the accelerometer patterns differ slightly; that’s also how fitness trackers differentiate between, say, walking and cycling.”

Combine that with a watch’s GPS function, and a potential stalker knows everything about what you are doing.

But hacking your daily life isn’t entirely as easy as it may sound.

SPY GAMES
“It’s also easy to see when a person is typing on a computer,” it reads. “But working out what they are typing is way more complex. Basically, different people typing the same phrase can produce very different accelerometer signals — although one person entering a password several times in a row will produce pretty similar graphs.

But computer algorithms can learn your individual patterns from a backlog of data — if it has enough of it.

“And therein lies trouble for a would-be spy: The constant upload of accelerometer readings consumes a fair bit of internet traffic and zaps the smartwatch battery in a matter of hours (six, to be precise, in our case),” Kaspersky says. “Both of those telltale signs are easy to spot, alerting the wearer that something is wrong. “

However, there are workarounds even for this.

“Both, however, are easily minimised by scooping up data selectively, for example when the target arrives at work, a likely time for password entry.”

KASPERSKY SHOULD KNOW
Kaspersky’s digital security products have recently been banned from use in all US federal agencies.

US officials last year expressed fears that the company could be influence by Kremlin espionage agencies to threaten US national security.

Kaspersky’s appeal against the move has been thrown out of court today.

“Given the lack of evidence of wrongdoing by the company and the imputation of malicious cyber activity by nation-states to a private company, these decisions have broad implications for the global technology community,” a Kaspersky spokesman said this week. “Policy prohibiting the US government’s use of Kaspersky Lab products and services actually undermines the government’s expressed goal of protecting federal systems from the most serious cyber threats.”