CAPTCHA Design: Color, Usability, and Security

Most user interfaces use color, which can greatly enhance their design. Because the use of color is typically a usability issue, it rarely causes security failures. However, using color when designing CAPTCHAs, a standard security technology that many commercial websites apply widely, can have an im...

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Bibliographic Details
Published in:IEEE internet computing 2012-03, Vol.16 (2), p.44-51
Main Authors: El Ahmad, A. S., Yan, J., Wai-Yin Ng
Format: Article
Language:English
Subjects:
Applied sciences
CAPTCHAs
Character recognition
Color
Computation
Computer science
control theory
systems
Computer security
Computer systems and distributed systems. User interface
Encoding
Exact sciences and technology
Failure
Image color analysis
Image segmentation
Internet
Internet security
Memory and file management (including protection and security)
Memory organisation. Data processing
robustness
Security
Software
usability
User interfaces
Websites
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Description
Summary:Most user interfaces use color, which can greatly enhance their design. Because the use of color is typically a usability issue, it rarely causes security failures. However, using color when designing CAPTCHAs, a standard security technology that many commercial websites apply widely, can have an impact on usability and interesting but critical implications for security. Here, the authors examine some CAPTCHAs to determine whether their use of color negatively affects their usability, security, or both.
ISSN:1089-7801
1941-0131
DOI:10.1109/MIC.2011.102