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April 20th, 2008, 07:31 AM

Oblax

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Captcha effectivity?

My captcha field asks what month is today? Is this an effective way on preventing those bots? What do you think?

April 20th, 2008, 10:55 AM

tkarkkainen

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Definitely effective enough against radnom spam bots. If someone bothered to write a bot to spam specifically your site, it would probably not be very effective. But if you're site isn't that high-profile, I think it's great. It doesn't annoy the user so much.

I thought about a captcha that would show the user a colored rectangle and ask for the color. The user would pick their answer from a drop-down box. To make it more complex to create a bot that would bypass the captcha, I would randomize the values that are to be sent in the POST variable.

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April 21st, 2008, 02:11 AM

Oblax

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That would be a cool color captcha! I was thinking that I would have a problem every time the month ends when a user fills up the form on the other side of the world. Haven't tested for that yet.

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