**7. Conclusion**

The rapid evolution of web and mobile applications turn these applications into an important part in people's daily life, where people rely on them to accomplish most of their activities. On the other hand, all the rapid improvement in these applications comes with a rapid increase in the number of malicious bots and applications that threatens the security of web and mobile applications.

Therefore, we introduced a new CAPTCHA technique that utilizes handwriting styles and we have put it through several experiments to adjust, improve, and test the technique while trying to reflect every needed adjustment to the technique immediately.

The introduced technique is a novel handwritten CAPTCHA, which basically relies on employing the handwriting characteristics that can only be interpreted by humans while being comparatively hard for OCRs to recognize. The proposed approach adopts four different languages (English, Arabic, Spanish, and French); each language has its own handwritten characters used in synthesizing the CAPTCHA text.

Moreover, few testing experiments have been conducted on the proposed CAPTCHA to test its robustness as well as the level of security it provides. The experiments were done using six different OCRs on 500 different CAPTCHA samples. Nevertheless, the results of the experiments manifest the significant benefits of utilizing handwriting characteristics with CAPTCHA samples [1].
