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+Bruteforce Protection
+=====================
+
+The brute force protection of Kanboard works at the user account level:
+
+- After 3 authentication failure for the same username, the login form show a captcha image to prevent automated bot tentatives.
+- After 6 authentication failure, the user account is locked down for a period of 15 minutes.
+
+This feature works only for authentication methods that use the login form.
+
+However, **after 3 authentication failure through the user API**, the account have to be unlocked by using the login form.
+
+Kanboard doesn't block any IP addresses since bots can use several anonymous proxies. However, you can use external tools like [fail2ban](http://www.fail2ban.org) to avoid massive scans.
+
+Default settings can be changed with these configuration variables:
+
+```php
+// Enable captcha after 3 authentication failure
+define('BRUTEFORCE_CAPTCHA', 3);
+
+// Lock the account after 6 authentication failure
+define('BRUTEFORCE_LOCKDOWN', 6);
+
+// Lock account duration in minute
+define('BRUTEFORCE_LOCKDOWN_DURATION', 15);
+```