PHP - Animated Captcha

[xrvel]

Hi, i want to share my animated captcha script.
Maybe you want to use it in your website or such

Image demo :





Download link :
http://dy.xrvel.googlepages.com/animatedcaptcha.zip

Last modified : November, 18th, 2008.


Improve your captcha !

[list]
[*]Create more background images with image editor to improve your background combination.

[*]Use more TTF fonts to improve your font combination.

[*]Use various text color.
[/list]

History :

Version 1,4,1
[list]
[*]new property "regenerate_session_id" (boolean) (PHP 4 >= 4.3.2, PHP 5).
  if true, session id is regenerated when a user enters invalid guess.
  I believe this slightly improves the captcha defense against automation / bot.
  Please check "animatedcaptcha_example.php" for detail.
  But warning, all related data in $_SESSION are destroyed too.
[*]More fonts are included.
[*]More and larger background images.
[*]Random alphabets are used as character set (a-z). The previous one used (a-f and 0-9)
[*]Random string length on captcha generator file.
[*]Some code change.
[/list]

Version 1,3,2
[list]
[*]More distortion option.
[*]Only the letters and grids are distorted.
The background is not distorted.
[*]More fix.
[/list]

Version 1,3,1
[list]
[*]Add background from GIF file to the captcha. (the old one used plain background).
[*]Add some distortion in the letters.
[*]Grid numbers are reduced.
[*]Please check your old captcha file ([SIZE=1]"animatedcaptcha_generate.php" in the example[/SIZE]), and replace it with the new one.
[*]Recommended frame number is 2 now. (size +- 7-8 kb)
[/list]

 

[xrvel]

HI

How does one add this to a script to protect it from spam...

Do you have instructions..

Tom

Hi,

For example in e-mail registration (such as Yahoo mail) usually we must enter image verification. If we do not enter the correct image text, the registration fails.
You can use this to protect your registration page / login page / comment page.
But you need to modify your old PHP script.
I have put an example in the download link.

For example you want to add captcha to your login page.

This is your old "login.php"

<?php
$username = $_POST['username'];
$password = $_POST['password'];

if ($username == '' || $password == '') {
   header('Location: login-form.php?error=empty')
   exit();
} else {
   // connect to database, etc
}

?>

You can modify it into this

<?php
session_start();// required

$username = $_POST['username'];
$password = $_POST['password'];

// Read the user's input
$captcha = $_POST['captcha'];

// Load the captcha class
require_once(dirname(__FILE__).'/animatedcaptcha.class.php');

// Create captcha object
$img = new animated_captcha();
$img->session_name = 'my_turing_test';
$img->magic_words('i am cool');

// Regenerate session id on invalid guess
$img->regenerate_session_id(true);

$valid = $img->validate($user_guess);// validate user's input

if (!$valid) {
   header('Location: login-form.php?error=captcha')
   exit();
} else if ($username == '' || $password == '') {
   header('Location: login-form.php?error=empty')
   exit();
} else {
   // connect to database, etc
}

?>

Kurniawan.

 

[nil_koushik]

thanks, it's look better...
:blink: :wave: :wave:

 

[CrackFeed.Com]

Nice, but your images took about a minute to load for me, I am on 3.5 Mb/s connection.