With many people wearing face masks everywhere they go during the coronavirus epidemic, iPhone users without Touch ID have to manually put in their pin number dozens of times every day to unlock their phones. Now there’s a possible solution. Tencent Security Xuanwu Lab published a tutorial on how to use Apple's Face ID with a face mask on.

Tutorials for this method have been circulating on social media for a while, but this is the first time it’s been validated by a security research lab. Xuanwu Lab said that it used the “mirror match” nature of Face ID. This could be a temporary measure for iPhone users during outbreak, the lab said, but it could lead to a reduction in security for Face ID. Tencent and Apple haven’t responded to questions about the technical details and security implications of this trick.