Re: CAPTCHA

[Robin Wood <robin () digininja org>]

On 25 January 2011 01:05, Steve Syfuhs <ssyfuhs () objectsharp com> wrote:
> This is a brilliant idea.  Did you come up with it?  If not, got any resources?

I've been doing it for ages now and I find it works quite well. Google
for "Reverse captcha" for more info.

Robin


> Sent from my Windows Phone
>
> -----Original Message-----
> From: Robin Wood
> Sent: Monday, January 24, 2011 7:49 PM
> To: Shang Tsung
> Cc: webappsec () securityfocus com
> Subject: Re: CAPTCHA
>
>
> On 24 January 2011 15:11, Shang Tsung <shangtsung71 () gmail com> wrote:
> > We are planning to use a CAPTCHA in order to stop spam engines from
> > filling our Online Forms. From a quick research I made, I found there
> > are good and there are bad types of CAPTCHA.
> >
> > Does anyone know if there are any standard and secure implementations
> > of CAPTCHA that we can use?
> >
> > Any good articles on the subject?
>
> I hate captchas, always have so I use a reverse captcha on sites that
> I build. You add a field to the form with name and id of email. You
> then give it a label that says "Please leave blank" and hide them both
> with CSS. Most people won't see them because the CSS works, even if
> they do see them they read the message and obey. Spam engines on the
> other hand spot the email field and happily fill it in. You then
> silently drop any contact forms with values in the email field.
>
> Normal humans aren't affected and you trick most generic bots.
>
> Robin
>
>
>
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