Abstract—This study investigates usability and effectiveness in shape and shape-color Geometric Shape Pattern-base CAPTCHA. The purpose of this study is to compare the amount of samples, sex and human generations on usability and effectiveness of the developed Geometric Shape Pattern-base CAPTCHA. There are 400 participants who approaching this study on the internet. The findings suggest that usability shown in percentage of success, both shape and shape-color Pattern-base CAPTCHA show highest percentage of success at 95.83% and 95.64% respectively. Moreover, it is demonstrated that the amount of time spent for finding the correct answer relates to the amount of sample of series. In addition, differences for sex reveal that both female and male can solve two types of CAPTCHA similarly. However, differences for human generations suggest that Baby Boomer I spends 4.63 to 7.38 seconds less to solve the problem of Pattern-base CAPTCHA. Moreover, in color-shape pattern, they spend 3.88 to 6.72 seconds less.
Index Terms—CAPTCHA, geometric shape, shape pattern.
Thawatwong Lawan is with Department of Computer Science, Faculty of Informatics, Mahasarakham University, Kantaravichai District Mahasarakham Province 44150, Thailand (e-mail: thawatwong @gmail.com).
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Cite:Thawatwong Lawan , "Study of Usability and Effectiveness in Shape and Shape-Color Geometric Shape Pattern-Based CAPTCHA," International Journal of Computer Theory and Engineering vol. 9, no. 6, pp. 462-465, 2017.
