Cryptology ePrint Archive: Report 2011/359

High-Entropy Visual Identification for Touch Screen Devices

Nathaniel Wesley Filardo and Giuseppe Ateniese

Abstract: We exhibit a system for improving the quality of user-derived keying material on touch-screen devices. We allow a device to recover previously generated, highly entropic data suitable for use as (part of) a strong secret key from a userís act of identifying to the device. Our system uses visual cryptography [22], using no additional electronics and no memorization on the part of the user. Instead, we require the use of a transparency overlaid on the touch-screen. Our scheme is similar to the identification scheme of [23] but tailored for constrained, touch-screen displays.

Category / Keywords: applications / visual cryptography, user identification

Publication Info: The 8th International Conference on Information Security Practice and Experience (ISPEC 2012). LNCS 7232 Springer-Verlag, 2012.

Date: received 4 Jul 2011, last revised 15 Jun 2012

Contact author: nwf at cs jhu edu

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Version: 20120615:155156 (All versions of this report)

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