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documentation:2.1:captcha [2019/01/15 15:55] (current)
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 +====== Captcha ======
 +
 +===== Presentation =====
 +
 +Captcha is a security mechanism aimed to prevent robots to submit forms.
 +
 +Captchas are available on the following forms:
 +  * Login form: where user enters login and password to authenticate
 +  * Password reset by mail form: where user enters mail to recover a lost password
 +  * Register form: where user enters information to create a new account
 +
 +<note important>​We use the Perl module GD::​SecurityImage to generate images, you need to install it if you enable Captcha feature.</​note>​
 +
 +===== Configuration =====
 +
 +Go in ''​General parameters''​ > ''​Portal''​ > ''​Captcha'':​
 +  * **Activation in login form**: set to 1 to display captcha in login form
 +  * **Activation in password reset by mail form**: set to 1 to display captcha in password reset by mail form
 +  * **Activation in register form**: set to 1 to display captcha in register form
 +  * **Size**: length of captcha