Which CAPTCHA should i use?

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290

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+1 Q:

Which CAPTCHA should i use?

Hi, 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?

+8 A:

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.

jeffamaphone 2009-12-31 06:04:28

Recaptcha is trivially easy to implement in ASP.Net, I was up and running within 10 minutes of crreating a Recaptcha account. Definitely recommended!

Moo 2009-12-31 11:36:23

It also has an audio option for blind users, if you need Section 508 compliance in the U.S.A.

Bratch 2010-02-11 19:30:38

+2 A:

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

o.k.w 2009-12-31 06:04:41

Thanks,But here i have question. recaptcha is used to correct digitize book while in case of captcha it's just to validate human or machine.If we have requirement like registration form then we can use captcha because we just need to stop automation for brute force attack. Also in case of recaptcha we have strong dependancy over recaptcha webservice.Is there any other reason for recaptcha?

Hemant Kothiyal 2009-12-31 14:15:16

Refer to jeffamaphone's answer, that are the reasons why you use ReCaptcha. Recaptcha is using human input to prevent spam as well as to help in digitizing of books. Yes, there's dependency, but it's the novelty of the idea that makes people want to use it too. If dependency is a technical constaint, then I'll say use other solution. Hope I answered your question. :P

o.k.w 2009-12-31 15:44:35

+1 A:

You must use Recaptcha primarily because they are the biggest captcha service out there. Its also for a good cause and you can be assured that they will update their algorithms to keep spammers and bots at bay.

Ritesh M Nayak 2009-12-31 06:05:17

By that logic, Windows is the best choice for an OS because it's used by the majority of the world.

Baddie 2009-12-31 06:18:26

A lot of users means, a lot more deployments, lot more spammers trying to beat the system. Which means that service providers will work that much harder to make their system failproof. Network externalities can be a powerful factor when choosing a service.

Ritesh M Nayak 2009-12-31 08:47:06

Well, behind the scenes they're actually commercial--they digitize words that NY Times among other organizations pay them to digitize. This means that they'll update their algorithms within the realm of their commercial interests to keep bots and spammers at bay.Chances are very strong that the future of CAPTCHA is images and not text. (I'm sure you've noticed that text-based CAPTCHAs are getting frustratingly hard, even for you, an actual human.)

sblom 2010-01-01 02:00:32

ansaurus

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Which CAPTCHA should i use?

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