Everything you need to know about Apple's new biometric Touch ID fingerprint identity scanner
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.