An image-based CAPTCHA scheme exploiting human appearance characteristics
KSII Transactions on Internet and Information Systems (TIIS), 2012•koreascience.kr
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 …
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 …
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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