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.

Proposed Alternatives to Visual-Based CAPTCHAs

Audio-based CAPTCHAs

In Developing Usable CAPTCHAs for...
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