Touch IDEditor: Rene Ritchie
Touch ID is Apple's biometric fingerprint authentication technology. With it, the Home button can now unlock your iPhone 5s and authorize your purchases on the iTunes Store. A capacitive ring activates the scanner on contact which then takes a high-resolution picture of your fingerprint. That fingerprint is then converted into a mathematical formula, encrypted, and carried over a hardware channel to a secure enclave on the Apple A7 chipset. If the fingerprint is recognized, a "yes" token is released. If it's not, a "no" token is released.
In the perpetual battle between security and convenience, where many people would rather go without a passcode or strong password than fuss with anything complicated on mobile, Apple's Touch ID fingerprint identity sensor aims to do for authentication what iCloud did for backup and restore - make it easy enough that people will actually use it.