¶ … Computer Science
Research on Alternatives to Visual-Based CAPTCHAs for Sight-Impaired Users
Created to block the Web bots used by spammers, CAPTCHA ("Completely Automated Public Turing Test to Tell Computers and Humans Apart") is a technology used to verify that a person, rather than an automated system, is entering the data. A visual-based CAPTCHA shows distorted text and then users type in what they see in order to proceed. Users encounter CAPTCHAs in a variety of different Internet activities, such as submitting online comments and forms, creating email accounts, and registering for networking sites [1].
Because CAPTCHAs cannot be read by machines, the screen-reading software used by blind computer users cannot read the text either [2], which leaves these people unable to use the Web sites. This paper reviews the literature on CAPTCHA alternatives for blind and sight-impaired users.
In Spoken Captcha: A Captcha System for Blind Users, the authors propose using a sound clip, with the user responding with the matching word [4]. A speech file of the user's voice is created, and the system then checks to ensure the word matches and to verify that the voice is not…
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