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Captcha, TimeOut and Hidden Textfield.
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Saira
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Saira asked on 16 Apr 2013, 08:57 AM
Hi Telerik,

I am a bit confused with the usage of the various modes of protection in RadCaptcha. Can someone get me how the Captcha, time out and Hidden textfield differ?

Thanks for your reply,
Saira

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Princy
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answered on 16 Apr 2013, 09:58 AM
Hi,

The Telerik RadCaptcha offers three modes of protection. These are actually spam protection strategies and you can define which strategy should be used for spam protection. For maximum security, by default, all of them are used.

The Automatic Robots Discovery strategy uses predefined rules which decide whether the input comes from a robot or not. At this point, there are two implemented rules that could be applied either separately or simultaneously.
  • Minimum form submission time - the presumption is that a human cannot input the fields in a form correctly for a time less than 3 seconds (this is set by default, and could be modified). If the submission is executed faster than the predefined value, it is assumed that the executor is a robot.
  • Hidden textbox in the form (the so-called "honeypot") - this rule requires the insertion of a textbox which is not visible when the form is styled. Still, it will be detected by a robot, and therefore if any data is entered, the executor is considered to be a robot. 
  • The next mode is the usual Captcha.

Thanks,
Princy.

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