• KSII Transactions on Internet and Information Systems
    Monthly Online Journal (eISSN: 1976-7277)

An Image-Based CAPTCHA Scheme Exploiting Human Appearance Characteristics

Vol. 6, No.2, February 28, 2012
10.3837/tiis.2012.02.017, Download Paper (Free):

Abstract

CAPTCHAs are automated tests that are there to avoid misuse of computing and information resources by bots. Typical text-based CAPTCHAs are proven to be vulnerable against malicious automated programs. In this paper, we present an image-based CAPTCHA scheme using easily identifiable human appearance characteristics that overcomes the weaknesses of current text-based schemes. We propose and evaluate two applications for our scheme involving 25 participants. Both applications use same characteristics but different classes against those characteristics. Application 1 is optimized for security while application 2 is optimized for usability. Experimental evaluation shows promising results having 83% human success rate with Application 2 as compared to 62% with Application 1.


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Cite this article

[IEEE Style]
Sajida Kalsoom, Sheikh Ziauddin and Abdul Rehman Abbasi, "An Image-Based CAPTCHA Scheme Exploiting Human Appearance Characteristics," KSII Transactions on Internet and Information Systems, vol. 6, no. 2, pp. 734-750, 2012. DOI: 10.3837/tiis.2012.02.017

[ACM Style]
Kalsoom, S., Ziauddin, S., and Abbasi, A. R. 2012. An Image-Based CAPTCHA Scheme Exploiting Human Appearance Characteristics. KSII Transactions on Internet and Information Systems, 6, 2, (2012), 734-750. DOI: 10.3837/tiis.2012.02.017