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Abstract
Nowadays, Internet is the center of attention as the integral part of mankind’s contemporary lifestyle. In order to provide the requested services and to conduct the user’s activities in many websites, there is a need to log into the system by user ID and password. Meanwhile, by finding the users’ passwords, hackers log into systems with other users passwords and conduct their illegal activities including withdrawing cash from the user’s account or stealing the user’s data. This paper provides a new method in order to prevent the entry of hackers into the system with the use of CAPTCHA procedure. In this method, if the password is wrongly entered on a number of occasions, the user’s account gets locked. Thereafter, the computer displays a random word for the user, calling on him to enter it. If the user is able to recognize the word properly, the user’s locked account will be opened. But if the user can not realize the word after several times, the user’s account gets locked for five minutes. With due regard of the weak point of OCR software, only a human user can enter the system and the brute force attacks of the hackers fail. This project has been prepared with the use of PHP language.
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