Browsing by Author "Yang, Xing-Dong"

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    CipherCard: Enhancing Security on Common Touchscreen Devices using Two-factor Authentication
    (2014-10-29) Seyed, Teddy; Yang, Xing-Dong; Tang, Anthony; Greenberg, Saul; Gu, Jiawei; Zhu, Bin; Cao, Xiang
    We present CipherCard, a physical token that defends against shoulder-surfing attacks on user authentication on touchscreen devices. Placed over a touchscreen pin-pad, CipherCard remaps a user’s touch points on the physical token to different locations on the pin-pad (i.e. as a substitution cipher). It translates a visible user password into a different system password received by a touchscreen, hiding the system password from observers. CipherCard enhances authentication security through Two-Factor Authentication (TFA), in that both the correct user password and a specific card are needed for authentication. We explore the design space of CipherCard, and describe three implemented variations each with unique capabilities. Based on user feedback, we discuss the security and usability implications of CipherCard, and describe several avenues for continued exploration.
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    SonicData: Broadcasting Data via Sound for Smartphones
    (2014-10-29) Nittala, Aditya Shekhar; Yang, Xing-Dong; Sharlin, Ehud; Bateman, Scott; Greenberg, Saul
    SonicData is a technique for broadcasting data to smartphones via audio streams using phone’s built-in microphone. SonicData augments an audio stream in the environment with nearly inaudible high-frequencies, allowing data to be sent to any smartphone in the vicinity using regular speakers and without any need for special hardware and software infrastructure or handshaking requirements. We detail the technical implementation of the SonicData prototype, outline a technical evaluation of its capabilities, and describe the results of a preliminary study of its effect on the quality of sound streams. We designed four interaction techniques that highlight SonicData’s potential as a complementary technique for broadcasting data to smartphones.