Designing human friendly human interaction proofs (HIPs)
Proceedings of the SIGCHI Conference on Human Factors in Computing Systems
Evaluating existing audio CAPTCHAs and an interface optimized for non-visual use
Proceedings of the SIGCHI Conference on Human Factors in Computing Systems
The Failure of Noise-Based Non-continuous Audio Captchas
SP '11 Proceedings of the 2011 IEEE Symposium on Security and Privacy
PassChords: secure multi-touch authentication for blind people
Proceedings of the 14th international ACM SIGACCESS conference on Computers and accessibility
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CAPTCHA (Completely Automatic Public Turing Test to Tell Computer and Human Apart) systems are a group of methods designed to distinguish between real human users and computer programs that are interacting with the system. Their goal is to ask questions which human users can easily answer, but current computers cannot. So their evaluation can be done in two domains: how hard are they for computers and how easy are they for humans. In this paper, we focus on the second part, and review accessibility of different types of CAPTCHA for human users, especially visually impaired and elderly people.