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Secure Device Pairing Based on a Visual Channel: Design and Usability Study
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Secure Device Pairing Based on a Visual Channel: Design and Usability Study  
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Pairing" is the establishment of authenticated key agreement between two devices over a wireless channel. Such de- vices are ad hoc in nature as they lack any common preshared se- crets or trusted authority. Fortunately, these devices can be con- nected via auxiliary physical (audio, visual, tactile) channels which can be authenticated by human users. They can, therefore, be used to form the basis of a pairing operation. Recently proposed pairing protocols and methods are based upon bidirectional physical chan- nels. However, various pairing scenarios are asymmetric in nature, i.e., only a unidirectional physical channel exists between two de- vices (such as between a cell phone and an access point). In this paper, we show how strong mutual authentication can be achieved even with a unidirectional visual channel, where prior methods could provide only a weaker property termed as presence. This couldhelpreducetheexecutiontimeandimproveusabilityofprior pairing methods. In addition, by adopting recently proposed im- proved pairing protocols, we propose how visual channel authenti- cationcanbeusedevenondevicesthathaveverylimiteddisplaying capabilities, all the way down to a device whose display consists of a cheap single light-source, such as a light-emitting diode. We present the results of a preliminary usability study evaluating our proposed method.
Journal: IEEE Transactions on Information Forensics and Security , vol. 6, no. 1, pp. 28-38, 2011
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