Alternative to captcha

Can anyone suggest me an alternative to captcha? I need the code too.
I dont want recaptchas. Some thing like 2 + 3 would do where numbers change frequently. Cannot find it on google, please help.

 

if you use wordpress, there is a plugin you can install, after that who submit a reply need to check a box only, its more easier to readers.

 

No, I am not using wordpress here.

 

Considering that captcha is an acronym (Completely Automated Public Turing test to tell Computers and Humans Apart), are you specifically against using a specific company's software? Or you do not want humans to prove themselves before sending a form?

 

no no, i m not against anyone. I dont want to use the letters or numbers captcha as it is very difficult to read

 

Interesting....
Have you considered to build your own? I haven't tried it though, but perhaps a simple CAPTCHA system could be built involving a few technologies:
1. Matching a user saved session UID to unique answer of the equation.
2. PHP's GD library
3. Ajax (additional).

 

it's a very simple php code, from the top of my head I would do something like this:
1) when printing the form (at the bottom / after the form)
<?php
$no1 = rand (1,9);
$no2 = rand (1,9);
$sum = $no1 + $no2;
$_SESSION['captcha'] = $sum;
?>

2) at the top where the validation goes:
<?php
if (isset($_POST)) {
if ($_POST['captcha'] == $_SESSION['captcha']) {
// your rest of code here
}
else {
// print validation error here
}
}
?>

 

Yes.
And continuing lokers' work, here's a rough sample with GD:
http://www.smokingscript.com/test/captcha/

 

Check Mollom

 

Mollom works well..