Speaking at the launch event in Cupertino, Apple's senior vice president of worldwide marketing Phil Schiller said: 'Half of smartphone customers do not set up passwords. [Touch ID] is an easier and more fun alternative.
'It uses key you have with you everywhere you go. Your finger.'
It works by using a small touch sensor encased around the home button that scans the layers of skin on a finger.
A user can 'train' their iPhone to read and learn their unique fingerprint and when they touch the home button, the phone is unlocked.
Touch ID can also replace an App Store password when buying music, apps or books.
It uses a 'laser cut sapphire crystal' to take a high-res image scan and the Touch ID software in iOS 7 determines whether the print belongs to the owner or not.
Schiller reassured users that Touch ID is secure by explaining that 'all fingerprint information is encrypted and stored securely inside the device's chip' adding the prints are not stored on an Apple server, or backed up to iCloud.
Yet security researchers aren't convinced. John Hawes from Sophos Security wrote: In the past, [fingerprint scanners] have proven rather unreliable, plagued with security worries.
'Fingerprints are not secret: we leave copies of them wherever we go. Once someone devious has got hold of a copy, sensors can be fooled.'
He continues that, unlike passwords, if fingerprint information is stolen it can't be changed.
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