A blogger has discovered what could potentially be a rather serious security flaw with the Apple Watch, with crafty thieves able to trick the wearable into believing it is still being worn by its owner.
The flaw exploits a feature of the Apple Watch that uses sensors to detect when it is being worn on a wrist. When you put on the Apple Watch you enter in your security pin, then as long as the Apple Watch knows it is still in contact with the wrist, you don’t have to enter in the pin again.
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https://www.techradar.com/news/wearables/security-flaw-makes-apple-watches-vulnerable-to-nimble-thieves-1294543