Comments on: How to implement CAPTCHAs without images http://www.xaprb.com/blog/2006/01/28/captchas-done-better/ Stay curious! Thu, 09 Feb 2012 09:56:43 +0000 hourly 1 http://wordpress.org/?v=3.2.1 By: comca http://www.xaprb.com/blog/2006/01/28/captchas-done-better/#comment-18529 comca Mon, 02 Aug 2010 18:35:57 +0000 http://www.xaprb.com/blog/?p=93#comment-18529 nice tut nice tut

]]> By: Fredricz http://www.xaprb.com/blog/2006/01/28/captchas-done-better/#comment-17262 Fredricz Wed, 11 Nov 2009 20:20:45 +0000 http://www.xaprb.com/blog/?p=93#comment-17262 Tried your script. I'm a bit noob at php, but my questions do not change at all. And when I choose the wrong options and submit, only half of the site appears. Tried your script. I’m a bit noob at php, but my questions do not change at all. And when I choose the wrong options and submit, only half of the site appears.

]]> By: rune http://www.xaprb.com/blog/2006/01/28/captchas-done-better/#comment-16206 rune Thu, 09 Apr 2009 09:58:26 +0000 http://www.xaprb.com/blog/?p=93#comment-16206 thx a lot. this is working perfectly with my textfiles :) thx a lot. this is working perfectly with my textfiles :)

]]> By: HAter of http://www.xaprb.com/blog/2006/01/28/captchas-done-better/#comment-13679 HAter of Tue, 13 Nov 2007 21:33:15 +0000 http://www.xaprb.com/blog/?p=93#comment-13679 One the easiest spam preventions is just to not allow people to insert html tags into the comment. I find 90% of all form spam has some kind of href in it, and I just /dev/null that stuff One the easiest spam preventions is just to not allow people to insert html tags into the comment. I find 90% of all form spam has some kind of href in it, and I just /dev/null that stuff

]]> By: Anonymous http://www.xaprb.com/blog/2006/01/28/captchas-done-better/#comment-13582 Anonymous Fri, 26 Oct 2007 15:25:36 +0000 http://www.xaprb.com/blog/?p=93#comment-13582 From a statistical standpoint, if you are providing the answers as selectable options (i.e. easily parseable from the question), that would be a bad implementation. If you have (say) 6 answers to every question, and an infinite number of questions, they could just spam you 6 times, and one would get through, and we know 1 attempt doesn't cost much. Certainly the typing/grammar aspect of it adds security. From a statistical standpoint, if you are providing the answers as selectable options (i.e. easily parseable from the question), that would be a bad implementation.

If you have (say) 6 answers to every question, and an infinite number of questions, they could just spam you 6 times, and one would get through, and we know 1 attempt doesn’t cost much.

Certainly the typing/grammar aspect of it adds security.

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