PolyTech Engineering Inc
In this paper, the authors focused upon pairing two devices using unidirectional OOB channels. They analyzed the protocol of and proved its security in a reasonable security model. They also devised an efficient implementation of an OOB channel using LEDs as transmitter and video camera as a receiver. With a display consisting of just two LEDs, their implementations take less than 6.5 seconds. With increase in the number of LEDs, the bandwidth of their channel gets better. For example, with six LEDs, they need less than 2.8 seconds. Their implementation has other useful applications in bluetooth/WiFi device discovery, sensor network key distribution and in general for data transmission.