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Image authentication (like in yahoo)

Posted: Sat Aug 19, 2006 9:43 am
by trigunmasteree
I was curious on how to make 'image authentication' (like one you see when you sign in a yahoo mail).
I was wondering how could the server (or maybe the code) generates an image of distorted random string like that.

Is there anyone who knows how to build this? Or at least a link I can donwload from?

Thx b4.

Posted: Sat Aug 19, 2006 9:46 am
by volka
search the forum/wikipedia/web for captcha

Posted: Fri Sep 01, 2006 3:21 pm
by han866
Here is a great site with Captcha code howto for PHP.

http://www.ejeliot.com/pages/2

HTH
hanji

Posted: Fri Sep 01, 2006 6:55 pm
by wei
here is an alogrithm to break captcha using computer

http://www.cs.sfu.ca/~mori/research/gimpy/

http://www.cs.sfu.ca/~mori/research/gim ... level.html

this research is about 4 years old.