[thelist] Preventing Malicious Login
Steve Clason
stevec at topdogstrategy.com
Sat Oct 15 10:10:11 CDT 2005
On 10/15/2005 8:22 AM Tim Burgan wrote:
> Hello,
>
> 1. What's the name of the image that is generated on some login
> websites that make the user enter the numbers displayed within the
> image into a text box?
The technique is generically called CAPTCHA, "Completely Automated
Public Turing test to tell computers and humans Apart".
>
> 2. What it is about these images that make image reader software from
> detecting what's written within the image?
That's the challenge--apparently they aren't 100% successful:
http://en.wikipedia.org/wiki/Captcha
(scroll down to "Circumvention").
--
Steve Clason
Web Design and Development
Boulder, Colorado, USA
www.topdogstrategy.com
(303)818-8590
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