Making CAPTCHAs clickable
We show how to convert regular keyboard-entry CAPTCHAs into clickable CAPTCHAs. The goal of this conversion is to simplify and speed-up the entry of the CAPTCHA solution, to minimize user frustration and permit the use of CAPTCHAs on devices where they would otherwise be unsuitable. We show how to obtain a secure clickable CAPTCHA that is well suited for use on cell phones. We support the practical viability of our approach by results from a user study, and an analysis of its security guarantees.
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Chow, R. ; Golle, P. ; Jakobsson, M. ; Wang, X.; Wang, L. Making CAPTCHAs clickable. Ninth Workshop on Mobile Computing Systems and Applications (HotMobile 2008); 2008 February 25-26; Napa, CA. NY: ACM; 2008; 91-94.
Copyright © ACM, 2008. This is the author's version of the work. It is posted here by permission of ACM for your personal use. Not for redistribution. The definitive version was published in HotMobile 2008 http://doi.acm.org/10.1145/1411759.1411783