README.md · mirrors_OWASP/PureCaptcha

PureCaptcha
===========

OWASP PureCaptcha project aims to help developers use easy-to-user independent CAPTCHAs in their project with zero hassle.
Traditionally, using CAPTCHAs required making accounts in a third party provider and using rigorous APIs, or installing many libraries
and then using text rendering and image modification libraries to render a CAPTCHA image.

PureCaptcha on the other hand, aims to do all of the above in one step. It includes very simple code to render a few ASCII characters
into bitmap images, and code to modify, scale, rotate and distort simple bitmap images. It then outputs the CAPTCHA as a simple 
monochrome BMP image (which has a very small size).

It also provides example usages for CAPTCHAs. It is of utmost importance to properly use CAPTCHAs, otherwise side-channel and logical
attacks would be viable on the system.

Read more about OWASP PureCaptcha at https://www.owasp.org/index.php/OWASP_PureCaptcha

##Usage##

**Basic usage**

Use the following script as the source of the captcha image.

require_once "purecaptcha.php";

$pureCaptcha = new PureCaptcha();

$captcha = $pureCaptcha->show();

Store `$captcha` in the session and compare it user input later.

**Complete API**

**captcha** : The text to be displayed in captcha
**length** : The length of the captcha text

**spacing** : The spacing between two characters in the captcha

**degree** : The degree of rotation of captcha text in clockwise direcion

**scaleX** : Amount to be scaled in x direction

**scaleY** : Amount to be scaled in y direction

**noisePercent** : The noise percentage

// Getters and setters are provided for each
    $pureCaptcha->setCaptcha("M2H7");
    $captha = $pureCaptcha->getCaptcha();

mirrors_OWASP/PureCaptcha

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