IEICE Communications Express
Online ISSN : 2187-0136
ISSN-L : 2187-0136
Special Cluster in Conjunction with IEICE General Conference 2019
Implementation of CAPTCHA suitable for mobile devices
Kentaro AburadaShotaro UsuzakiHisaaki YamabaTetsuro KatayamaMasayuki MukunokiMirang ParkNaonobu Okazaki
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2019 Volume 8 Issue 12 Pages 601-605


CAPTCHA is a technology designed to prevent automated programs (known as bots) from acquiring access to on-line accounts to send spam mail, manipulate vote numbers in on-line polls, or take other malicious actions. In addition, access to Web services has been incorporated into mobile devices, such as smartphones. However, because most CAPTCHAs are not designed for mobile devices, user-friendly CAPTCHA for mobile devices is required. Thus, we implemented CAPTCHA on mobile devices and evaluated its resistance to bots. Our CAPTCHA showed robustness against bots, with good usability.

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© 2019 The Institute of Electronics, Information and Communication Engineers
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