Patent ID: 8560004

Claim:
A method comprising: receiving, by one or more processors, a first signal from a first sensor of a mobile computing device, wherein the first signal represents a first action of a user of the mobile computing device, and wherein the mobile computing device is in a low power state in which a presence-sensitive screen is deactivated prior to receiving the first signal from the first sensor of the mobile computing device; activating, based at least in part on the first signal, a second sensor of the mobile computing device; receiving, by the one or more processors, a second signal from the second sensor, wherein the second signal represents a second action of the user of the mobile computing device; activating, based at least in part on the first and second signals, an input device of the mobile computing device, wherein the input device comprises a microphone or a camera; receiving, by the one or more processors, a first data sample captured by the input device; determining, by the one or more processors, a captured template based at least in part on the first data sample, wherein the captured template comprises one or more features of the first data sample; comparing, by the one or more processors, the captured template to a reference template, wherein the reference template comprises one or more features of a second data sample; and responsive to determining that the captured template substantially matches the reference template, unlocking, by the one or more processors, the mobile computing device.