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Over the many years used CAPTCHA CAPTCHA to protect the sites from registration indiscriminate and reduce significantly the number of messages spam e- automatic , but with the great advances in artificial intelligence during the past few years has led to reduce the size of the gap between the user of the human and the possibilities of hardware and software systems in decoding distorting the text codes .

Hence , a team of researchers in the private reCAPTCHA Backlinks extensive studies and make adjustments and improvements to know better ways to protect users from hackers and indiscriminate attacks. As a result, reCAPTCHA has become the largest user 's ability to distinguish human systems and scripts .

This update reCAPTCHA uses advanced risk analysis techniques , which takes into account the behavior of the same user with CAPTCHA writing cases and the way his behavior during and after the interaction with the encoded text . This means that the CAPTCHA tests today tend to be more a tool known on user interaction rather than his choice to distinguish between robots and human user .

After all this Google launched an update on CAPTCHA creates different classes for different types of users , and this deal polymorphic allows the user to identify the most if the human person or a robot software and thus provide appropriate CAPTCHA over him .