Video Captcha from NuCaptcha
Canadian startup NuCaptcha introduced a new kind of protection against robot commentators - video captcha. The developers claim that people solve their video puzzle at once, but programmers will have to work hard to create an automatic recognition program.
In essence, a video captcha is a string of characters running along a curved line, from which a person is asked to recognize the last three, made in red. The background on which the letters are running is customizable. The number and color of key letters is not; These parameters are controlled in NuCaptcha and can be changed at any time if the developers decide that this is necessary to strengthen the protection against robots, as well as people recognizing captcha for a fee.
However, some additional protection in the system already exists. For example, if the system suspects in user kapcha- "Negro" (the method was not specified, but is likely to analyze the frequency of the input responses to videokapchi with the same IP-address), running a string of characters in the following captcha will slow down more and more. Accordingly, the appearance of key red letters on the screen will be delayed, so that a professional captcha recognizer will take 15 seconds for each video captcha. Obviously, NuCaptcha believes that it will make the job of recognizing video caps economically unprofitable, even for Indians .
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Currently, there are APIs for using video caps in PHP, .NET and Java. There is also a wordpress plugin. Over time, they promise support for other languages and platforms.
About cons. The creeping line consists of English words, respectively, the red letters are selected from the Latin alphabet. English is also used in the additional elements of the video captcha. NuCaptcha is now working on supporting other languages, but it is not clear whether Russian will be among these languages.
You can try this captcha in action on the NuCaptcha website .
A source
In essence, a video captcha is a string of characters running along a curved line, from which a person is asked to recognize the last three, made in red. The background on which the letters are running is customizable. The number and color of key letters is not; These parameters are controlled in NuCaptcha and can be changed at any time if the developers decide that this is necessary to strengthen the protection against robots, as well as people recognizing captcha for a fee.
However, some additional protection in the system already exists. For example, if the system suspects in user kapcha- "Negro" (the method was not specified, but is likely to analyze the frequency of the input responses to videokapchi with the same IP-address), running a string of characters in the following captcha will slow down more and more. Accordingly, the appearance of key red letters on the screen will be delayed, so that a professional captcha recognizer will take 15 seconds for each video captcha. Obviously, NuCaptcha believes that it will make the job of recognizing video caps economically unprofitable, even for Indians .
')
Currently, there are APIs for using video caps in PHP, .NET and Java. There is also a wordpress plugin. Over time, they promise support for other languages and platforms.
About cons. The creeping line consists of English words, respectively, the red letters are selected from the Latin alphabet. English is also used in the additional elements of the video captcha. NuCaptcha is now working on supporting other languages, but it is not clear whether Russian will be among these languages.
You can try this captcha in action on the NuCaptcha website .
A source
Source: https://habr.com/ru/post/98162/
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