Which CAPTCHA should i use?

Question

I would like to implement CAPTCHA in my website for secure registration. I have seen many CAPTCHA and RECAPTCHA solution.

I would like to know which control is highly recommended for ASP.NNET Website. For which control i should make my trust?

Please help?

Answer 1

I have used, and personally recommend Recaptcha.

• It has nice ASP support and good documentation.
• It has a strong support community.
• It is well known and widely used in the industry.
• It does useful work while being a CAPTCHA.
• It's free.

Answer 2

This question is rather subjective. But I'll answer it anyway.

You do know that recaptcha is not only a CAPTCHA component right? There are 'meaningful' purpose behind it.

I've personally use it before and find it very will implemented and easy to use.

However it is not very theme-able but that's not a big issue for most usage.

There's a catch though. If you are using it in a closed environment, e.g. Intranet with no internet access, you will not be able to get it to work.

For other .NET based CAPTCHA controls, there are tons out there. Can't provide much information for you as I've not used them extensively.

Here's an 'old' but intersting article written by Jeff which you might want to read:
An ASP.NET CAPTCHA Server Control