Sources: CCC [press release], Is Touch ID Hacked Yet [YES!], YouTube [CCC]
quote: In the Authentec/Apple patent a fingertip is imaged via a different technique: Radiofrequency scanning. Skin and flesh, thanks to the cocktail of chemicals they contain, have their own electrical signature--meaning a human body can in fact block a radio signal of the right frequency, while other frequencies sail right through us more or less unaffected. The sensor in the new patent makes use of this fact by sending out very precise radio signals over a very short range and detecting the signals that have been affected by the bumps and gaps in a human fingertip. Basically the tiny ridges of flesh in a fingerprint affect the electrical signals coming from the sensor array in a measurable way, allowing the device to calculate the position and alignment of all the whorls and loops.The advantage of this system is that you couldn't fool it with an image of a fingerprint or a latex cast of a fingerprint because the RF signals from the sensor have to interact with a material that has a flesh-like radio response in order to register the print. It's suggested that the sensor can also detect live tissue beyond the simple skin of a fingerprint, which removes the one scary scenario whereby a determined thief would "steal" the finger in question.Offering total security via reliable fingerprint technology built right in is a big deal for corporate and government IT. I expect this will make the iPhone 5S the default phone for corporate customers.