In fact, Apple even discounted the possibility that a severed finger could be used.
Enter the Chaos Computer Club, a group many of you will have heard of before. It now claims that just days after the iPhone 5s release, it can already spoof Apple's Touch ID "using easy everyday means."
"A fingerprint of the phone user, photographed from a glass surface, was enough to create a fake finger that could unlock an iPhone 5s secured with TouchID," CCC claims.
"This demonstrates – again – that fingerprint biometrics is unsuitable as access control method and should be avoided."
A hacker with the nickname Starbug claimed all the group had to do was ramp up the resolution of its fake. "As we have said now for more than years, fingerprints should not be used to secure anything. You leave them everywhere, and it is far too easy to make fake fingers out of lifted prints."
The group has posted a video which allegedly shows the spoof working.
More information: Chaos Computer Club.