DotCHA: An Interactive 3D Text-based CAPTCHA

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 a...

Full description

Saved in:
Bibliographic Details
Published in:Journal of web engineering 2020-01, Vol.18 (8), p.837
Main Authors: Kim, Suzi, Choi, Sunghee
Format: Article
Language:English
Subjects:
Automation
Cognitive ability
Machine learning
Typography
Usability
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary: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.
ISSN:1540-9589
1544-5976
DOI:10.13052/jwe1540-9589.1884