Germany’s Chaos Computer Club claims it “successfully bypassed the biometric security of Apple’s Touch ID using easy everyday means”.
By photographing a fingerprint left on a glass surface and creating a fake finger they were able to unlock the phone, the hackers claim.
But Apple maintains Touch ID is secure.
On its website the iPhone maker says there is a one in 50,000 chance of two separate fingerprints being alike and the technology provides “a very high level of security”.
Karsten Nohl, chief scientist at SRLabs, a German hacking think tank, told the BBC: “It would have been incredible if Apple had managed to do something the rest of the biometrics industry has failed to achieve after decades of trying, so I’m not surprised it was hacked after just one day.