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jCAPTCHA: Accessible Human Validation

Davidson, M, Renaud, K and Li, S (2014) jCAPTCHA: Accessible Human Validation In: 14th International Conference on Computers Helping People with Special Needs (ICCHP 2014), 2014-07-09 - 2014-07-11, Paris, France.

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CAPTCHAs are a widely deployed mechanism for ensuring that a web site user is a human, and not a software agent. They ought to be relatively easy for a human to solve, but hard for software to interpret. Most CAPTCHAs are visual, and this marginalises users with visual impairments. A variety of audible CAPTCHAs have been trialled but these have not been very successful, largely because they are easily interpreted by automated tools and, at the same time, tend to be too challenging for the very humans they are supposed to verify. In this paper an alternative audio CAPTCHA, jCAPTCHA (Jumbled Words CAPTCHA), is presented. We report on the evaluation of jCAPTCHA by 272 human users, of whom 169 used screen readers, both in terms of usability and resistance to software interpretation.

Item Type: Conference or Workshop Item (Conference Paper)
Divisions : Faculty of Engineering and Physical Sciences > Computing Science
Authors :
Davidson, M
Renaud, K
Li, S
Date : July 2014
DOI : 10.1007/978-3-319-08596-8_19
Contributors :
Related URLs :
Additional Information : The original publication is available at
Depositing User : Symplectic Elements
Date Deposited : 05 Nov 2014 16:54
Last Modified : 31 Oct 2017 16:49

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