Re: CAPTCHA
Robin Wood <[email protected]>
| Newsgroups | gmane.comp.security.web-applications |
|---|---|
| Message-ID | <[email protected]> |
On 24 January 2011 15:11, Shang Tsung <[email protected]> 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 This list is sponsored by Cenzic -------------------------------------- Let Us Hack You. Before Hackers Do! It's Finally Here - The Cenzic Website HealthCheck. FREE. Request Yours Now! http://www.cenzic.com/2009HClaunch_Securityfocus --------------------------------------