The news comes after a string of code from iOS 7 revealing "a fingerprint that changes colour during the setup process" was posted online in July, sparking rumours that the new iPhone could contain a fingerprint sensor.
Apple purchased mobile and network security company AuthenTec, which produces hardware including fingerprint sensors, last year for $356m, fuelling further speculation about the sensor's introduction into future Apple products.
Fingerprint sensors have not been widely used across smartphones in the past. Motorola released the Atrix 4G in 2011 which featured a biometric fingerprint sensor it claimed offered a level of security surpassing password or PIN locks. However, customers reported mixed levels of success with the scanner, with many saying the sensor failed to recognise their fingerprint.
Other digital security systems include the Samsung Galaxy S3's Face Unlock feature, also available on Google's Nexus 4, and in the future it is likely that phones will unlock upon recognition of their owner's voice.
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