Simple User Authentication Image

One day I needed an easy and simple verification script that creates an image with random numbers in it, and prompts them to type in the numbers in the image.

The script that I ended up with finds a random number, encrypts it, and stores it in a session so that you can compare it with the users input later. It is good for checking to see if the person signing up for a site is a person or a bot.

I will probably add on to it later, and make it so that you can add a background, and letters. Please let me know of any bugs.

Requires PHP 5

To install, paste this code into a PHP document, and name it what you want.

To display it, simply use the HTML image tag, and point to that PHP document.

<img src="phpcode.php">

To check if the user has entered the number shown in the image, use an if statement. Look at the source code below for an example.

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Relish

Posted 90 Days Ago

Glad you liked it, Ill change the double md5

Binaries

Posted 90 Days Ago

$correctNum = md5($_SESSION['random_value']); $_SESSION['random_value'] = md5($this->random); You're encrypting the session twice, either remove the $correctNum and just use the $_SESSION['random_value'] or encrypt the users input twice with md5. This went wonders on our site :D, works great :P

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