Abstract: Methods and apparatuses are described for secure transmission and authentication of a user credential. A device comprising a memory, a processor, and a laser diode identifies a first user credential comprising a sequence of alphanumeric characters, converts the first user credential into a first plurality of analog signals, and activates the laser diode using the first plurality of analog signals to emit light detectable by a emitted light sensor of a second device. The second device comprising a memory, a processor, and an emitted light sensor generates a second plurality of analog signals corresponding to light emitted by the laser diode and detected by the emitted light sensor, converts the second plurality of analog signals into a second user credential, and authenticates the second user credential.

Abstract: Methods and apparatuses are described for secure transmission and authentication of a user credential. A comprising a memory, a processor, and a laser diode identifies a first user credential comprising a sequence of alphanumeric characters, converts the first user credential into a first plurality of analog signals, activates the laser diode using the first plurality of analog signals to emit light detectable by the sensor of the second computing device. The second computing device comprising a memory, a processor, and a sensor for detecting emitted light generates a second plurality of analog signals corresponding to light emitted by the laser diode and detected by the sensor, converts the second plurality of analog signals into a second user credential, and authenticates the second user credential.