US patent no. 9,436,864 for “Electronic device performing finger biometric pre-matching and related methods” in the field of finger sensors. It’s an authentication device that more quickly performs a finger matching operation.

Finger print sensor does it provides security that is required than a PIN or password? Already a lot of smart mobiles exist with the technology of unlocking with finger print that provides a great convenience than the usual unlock methods.

What’s so special about the Apple’s finger print unlock is that it requires a passcode after a cold boot, its touch ID expires after 48 hours or after 6 hours if not unlocked with a passcode during the last 24 hours.

It asks for the authentication passcodes before registering or altering fingerprints. Samsung phones does not have any such requirements, in some devices, finger prints could be registered on unlocked devices without entering the passcode.

Apple ensures hard-ware storage system, other mobiles jus stores finger prints as user accessible files which could have the possibilities of being hacked.

Apple sensor does not expose encrypted data until the device is unlocked with a passcode. Each touch ID sensor is individually paired with secure enclave Unauthorized replacement of the Home button renders Touch ID unusable (users must authenticate with passcode only).

In Android 6.0 specifications there is no set requirement, any replacement sensor would do the trick.

Last generation Touch ID (iPhone 6s and 6s Plus) offer fast and reliable unlock.

Apple has made the button with one of the hardest and clearest sapphire crystal which provides a great protection for the sensor and act as a lens to precisely focus it on the finger.

The finger print reading and touch Id is detected by the steel rings surrounding the button. A high-resolution image from small sections of the fingerprint from the subepidermal layers of your skin is done by the advanced capacitive systems. arch, loop, or whorl are the three categories of the finger print sensors in the system.

Touch ID can even read multiple fingerprints, and it also reads the fingerprints in 360-degrees of orientation followed by the creation of a mathematical representation of the fingerprint and the system compares this to the enrolled fingerprint data to identify a match and unlock your device. Touch ID will incrementally add new sections of your fingerprint to your enrolled fingerprint data to improve matching accuracy over time. Touch ID uses all of this to provide an accurate match and a very high level of security.

Keywords-biometric, finger print, sensors, touch ID, security