CAPTCHA is the most important method for protecting malicious software gains access to the system through the Internet. However, this technique has many difficulties for users to solve their questions in various presentation styles. Therefore, the usability of CAPTCHA is a significant issue that all designers must concern; otherwise, authorized users will not be able to gain access to the required system. In this research, many factors are studied to determine factors that affect the effectiveness of using CAPTCHA. The study was performed in two nationalities: Bhutanese and Indian. This study shows some dissimilarity between these nations that can have impact in the success of using CAPTCHA.
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