Comments on: What is CAPTCHA? http://www.richardfarrar.com/what-is-captcha/?utm_source=rss&utm_medium=rss&utm_campaign=what-is-captcha Life, Technology and Everything... Wed, 21 Jul 2010 18:25:29 +0000 hourly 1 http://wordpress.org/?v=abc By: Mark S http://www.richardfarrar.com/what-is-captcha/comment-page-1/#comment-107 Mark S Mon, 03 Nov 2008 13:13:27 +0000 http://www.richardfarrar.com/what-is-captcha/#comment-107 Captchas are useless. You do not gain anything by making the forms unusable to your visitors. Simple HTML techniques can protect your forms 100%, without jscripts , ajax, or other cryptic image methods. Captchas are useless. You do not gain anything by making the forms unusable to your visitors. Simple HTML techniques can protect your forms 100%, without jscripts , ajax, or other cryptic image methods.

]]> By: Richard http://www.richardfarrar.com/what-is-captcha/comment-page-1/#comment-77 Richard Tue, 26 Aug 2008 16:59:58 +0000 http://www.richardfarrar.com/what-is-captcha/#comment-77 <b>@Steve:</b> Thanks, that was the aim of the article as an overview of CAPTCHA. <b>@Richard:</b> As you say, it's constant battle between the developers of the CAPTCHA systems and the spam bot developers; at least it keeps you in a job :-) By using AJAX, people have to have Javascript enabled in their browser to even see your form I guess. Like you though, I can't see why you'd ever really want a form indexed by a search engine, so that's no great loss. @Steve: Thanks, that was the aim of the article as an overview of CAPTCHA.

@Richard: As you say, it’s constant battle between the developers of the CAPTCHA systems and the spam bot developers; at least it keeps you in a job :-) By using AJAX, people have to have Javascript enabled in their browser to even see your form I guess. Like you though, I can’t see why you’d ever really want a form indexed by a search engine, so that’s no great loss.

]]> By: Steve http://www.richardfarrar.com/what-is-captcha/comment-page-1/#comment-76 Steve Mon, 25 Aug 2008 23:35:25 +0000 http://www.richardfarrar.com/what-is-captcha/#comment-76 Hey Richard! Excellent post YET AGAIN!!! What more can I say, I have always wanted to know the purpose and reason for CAPTCHA and you have explained it in lay mans terms and yet not left anything necessary (I assume anyway) from your explanation. Top marks!! Steve Hey Richard!

Excellent post YET AGAIN!!! What more can I say, I have always wanted to know the purpose and reason for CAPTCHA and you have explained it in lay mans terms and yet not left anything necessary (I assume anyway) from your explanation.

Top marks!!

Steve

]]> By: Richard Rees http://www.richardfarrar.com/what-is-captcha/comment-page-1/#comment-75 Richard Rees Mon, 25 Aug 2008 22:43:15 +0000 http://www.richardfarrar.com/what-is-captcha/#comment-75 Captchas are unfortunately starting to get solved by the bots. Bots are getting cleverer and cleverer. I get around this by tending to make my forms available only via AJAX (modal popups etc.). I've yet to find a bot that can make an ajax call (I'm sure it's just a matter of time). The downside of using ajax is that none of the content on the form is spiderable, but its rare that you would want a search engine spidering a page with a form on anyways. Anyway, if you like captchas this article may change your mind.... http://www.johnmwillis.com/other/top-10-worst-captchas/ Captchas are unfortunately starting to get solved by the bots. Bots are getting cleverer and cleverer.

I get around this by tending to make my forms available only via AJAX (modal popups etc.). I’ve yet to find a bot that can make an ajax call (I’m sure it’s just a matter of time). The downside of using ajax is that none of the content on the form is spiderable, but its rare that you would want a search engine spidering a page with a form on anyways.

Anyway, if you like captchas this article may change your mind….

http://www.johnmwillis.com/other/top-10-worst-captchas/

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