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Users of public Wi-Fi networks risk being tricked into connecting to `evil twin' access points set up by attackers to launch man-in-the-middle attacks. We present a system which employs post hoc validation of an anonymous Diffie-Hellman key exchange undertaken as part of an 802.1X/EAP-TTLS network association process. Our system utilises an additional secure auxilliary channel to run a modified version...
We present "screen codes" - a space- and time-efficient, aesthetically compelling method for transferring data from a display (e.g. a VDU or projected public display) to a camera equipped mobile device. Screen codes encode data as a grid of luminosity fluctuations within an arbitrary image, displayed on the video screen. These fluctuations, manifested as a "twinkling" within the...
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