DotCHA: An Interactive 3D Text-based CAPTCHA

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We introduce a new type of 3D text-based CAPTCHA, called DotCHA, which relies on human interaction and overcomes the limitations of existing 2D and 3D CAPTCHAs. DotCHA asks users to rotate a 3D text model to identify the correct letters. The 3D text model is a twisted form of sequential 3D letters around a center pivot axis, and it shows different letters depending on the rotation angle. Because each model consists of many small spheres instead of a solid letter model, DotCHA is classified as a scatter-type CAPTCHA and resists character segmentation attacks. Moreover, DotCHA is resistant to machine learning attacks because each letter is only identified in a particular direction. We demonstrate that DotCHA is resistant to existing types of attacks while maintaining usability.
Publisher
RIVER PUBLISHERS
Issue Date
2020-01
Language
English
Article Type
Article
Citation

JOURNAL OF WEB ENGINEERING, v.18, no.8, pp.837 - 864

ISSN
1540-9589
DOI
10.13052/jwe1540-9589.1884
URI
http://hdl.handle.net/10203/275554
Appears in Collection
CS-Journal Papers(저널논문)
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