Exploring the Internet, everyone can sometimes face the need to enter not very distinct letters from a drawing or cope with an easy task in order to register, write a comment or go to another site. This type of tasks are called CAPTCHA.

There are a lot of varieties of captcha: distorted text, mathematical actions, questions, puzzles, choosing the right picture, and so on. All this in frequent cases does not cause difficulties for humans, but for robots until some time it was an almost impossible task.The captcha appeared several decades ago and at first showed high efficiency in the fight against robots. But over time, the method began to become obsolete: now you can't protect yourself with a captcha, despite other problems.

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