Abstract:Today computer and the internet play an important role in our daily life. We have shown highly remarkable of automated behavior that is criminal in violation of terms of services such as auto sharing or send friend request. SO, CAPTCHA is used for protecting webpages against automated programs which are called bots. It is providing challenge response tests that determine whether or not the users are human or bot. It contains various contorted letters that are difficult for attacker's bots, but easy for humans.… Show more
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