Gesture Input as an Out-of-band Channel

In recent years, there has been growing interest in secure pairing, whichrefers to the establishment of a secure communication channel between two mobiledevices. There are a number of descriptions of the various types of out-of-band (OOB)channels, through which authentication data can be transferred under a user’s controland involvement. However, none have become widely used due to their lack ofadaptability to the variety of mobile devices. In this paper, we introduce a new OOB channel, which uses accelerometer-basedgesture input. The gesture-based OOB channel is suitable for all kinds of mobiledevices, including input/output constraint devices, as the accelerometer is small andincurs only a small computational overhead. We implemented and evaluated thechannel using an Apple iPhone handset. The results demonstrate that the channel isviable with completion times and error rates that are comparable with other OOBchannels. KCI Citation Count: 0