Apple's Face ID security feature on the iPhone X was successfully hacked using a homemade 3D-printed mask, raising questions about the system's security.

A researcher at Vietnamese cybersecurity firm Bkav claimed to fool Apple’s Face ID facial recognition authentication system using a mask made with a 3D printer, silicone and paper tape, and with special processing on the cheeks and face areas.

The hack was greeted with scepticism by some security professionals. However, Reuters said it worked successfully several times when it was shown the demonstration. It was the first reported case of researchers seemingly tricking Face ID. 

The hack raises concerns for high-profile individuals whose facial features are easily accessible, and challenges Apple's claims about the strength of Face ID's security, as the company had stated it tested against professional mask makers and makeup artists.

Bkav had earlier demonstrated how to hack facial recognition-based systems in laptops from Asus, Toshiba and Lenovo.