I personally get very frustrated with captchas, especially really awkwardly hard to interpret ones. And the questions below are novel for a while but wear you down after 10-20 a day!
One reason I get frustrated with them is that there are great beyesian filters out there that just "know" if a comment is spam or not. When you submit something, it asks a global webservice if the text seems human or not, and its very accurate. I only realised these existed late last year, but they've been a godsend for the sites we build.
We have a demo of this at http://demo.silverstripe.com/blog
You can download the code for this off our site (silverstripe.com) -- BSD open source :)
Siggy
--
On Thu, 15 Feb 2007 09:17:40 -0000, "Chris Taylor" <[EMAIL PROTECTED]> wrote:
> I use the question/answer spam filter technique on my community blog site,
> but provide the answers with the question. For example:
>
> Is a banana yellow or red?
> What colour is the summer sky - green or blue?
> What is 3 + 1? Is it 823, 4 or 9117?
>
> That way people can make a guess even if they aren't sure of the answer.
> So
> far we've done well at keeping automated spam out of the system as (so
> far)
> spambots don't know about this technique or aren't sophisticated enough to
> parse the answer out.
>
> Plus there's the opportunity to put a smile on people's faces with a
> slightly cheeky question ;0)
>
> Chris
>
>
>
>
Sigurd Magnusson | Operations Director
SilverStripe
http://www.silverstripe.com
|
Level 3, Symes De Silva House 97-99 Courtenay Place Wellington, New Zealand |
 |
> From: [email protected] [mailto:[EMAIL PROTECTED]
> On Behalf Of Mike at Green-Beast.com
> Sent: 13 February 2007 20:57
> To: [email protected]
> Subject: Re: [WSG] OT? - spam in forms
>
> Hello Andrew,
>
> You're right about the language possibly causing a usability barrier. I
> guess the best way around that is to use math, i.e, 1+1=, since that's
> more
> international. The default Q&A out of the box is "Is fire hot or cold?" I
> figured that one might be known by many people, even those with cognitive
> disabilities since they are taught that "Fire is hot!" at a young age.
>
> I have tested the form for some people in other countries, though, and I
> usually manage to figure it out... sometimes having to determine the Latin
> root of the words if it's a romantic language :-)
>
> I could probably remove that whole thing and get away with it; there are
> 15
> other anti-spam/anti-exploit measures in play with the script. I didn't
> take
>
> any chances though since those spammers can be pretty clever and I don't
> fully understand the bag of tricks they dig into. I erred on the side of
> caution.
>
> Cheers.
>
> Mike
>
> ----- Original Message -----
> From: "Andrew Ingram" <[EMAIL PROTECTED]>
> To: <[email protected]>
> Sent: Tuesday, February 13, 2007 2:21 PM
> Subject: Re: [WSG] OT? - spam in forms
>
>
> Mike,
>
> I've been suggesting the Question/Answer method to people for some time
> and it's definitely my preferred method. It's so brilliantly simple yet
> nobody really seems to use it. I guess there's a language issue that
> might need addressing, but it's definitely an improvement on images.
>
> - Andrew Ingram
>
> Mike at Green-Beast.com wrote:
>> Hello Bob,
>>
>> This should solve your problem:
>>
>> Stand-alone version:
>> http://green-beast.com/blog/?page_id=71
>> Demo: http://green-beast.com/gbcf/
>>
>> WordPress plugin version:
>> http://green-beast.com/blog/?page_id=136
>> Demo: http://green-beast.com/blog/?page_id=135
>>
>> Both are standards-compliant and accessible... and they seem to work
>> rather
>> well based on feedback and my own experiences with using them.
>>
>>
>> Respectfully,
>> Mike Cherim
>>
>>
>>
>> ----- Original Message -----
>> From: "Designer" <[EMAIL PROTECTED]>
>> To: <[email protected]>
>> Sent: Tuesday, February 13, 2007 1:06 PM
>> Subject: [WSG] OT? - spam in forms
>>
>>
>> I seem to be going through a spate of getting spam in a form on one of
>> my sites (the one in the link, below, actually.)
>>
>> So I tried using PHP to randomly display an image and getting the form
>> user to input what it says.
>>
>> I still get spam! I'm presuming that this is because the spammer will
>> work with _javascript_ turned off, making the js checkform routine
> useless?
>>
>> Sorry if this is OT - can anyone point me to a solution?
>>
>> Thanks for any help . . .
>>
>
>
>
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