Scale Development to Measure Usability of Text-Based CAPTCHA

  • Samar Swaid
Part of the Communications in Computer and Information Science book series (CCIS, volume 373)


Completely Automated Public Turing Tests to Tell Computers and Humans Apart (CAPTCHA) is one of the important security mechanisms to avoid spamming and hacking on websites. This study focuses on identifying the usability dimensions of text-based CAPTCHA based on multi-method approach. Research methods of Think-Aloud protocol, factor analysis and equation modeling are applied. Analytical work shows that usability of CAPTCHA is formed of (i) content; (ii) format; (iii) distortion and (iv) services. The scale is used to evaluate the usability of ReCAPTCHA, JCAPTCHA and GIMBY. The main contribution of the study is constructing a scale, systematically, to quantitatively evaluate the usability of text-based CAPTCHA.


Usability Security CAPTCHA Usable Security Users Perceptions Design Factor Analysis 


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Copyright information

© Springer-Verlag Berlin Heidelberg 2013

Authors and Affiliations

  • Samar Swaid
    • 1
  1. 1.Philander Smith CollegeLittle RockUSA

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