WordPress.org

Why should i use reCAPTCHA and not (put_other_captcha_here) ?

Read the answer here : http://www.google.com/recaptcha/learnmore

And here : http://www.google.com/recaptcha/digitizing

What if somehow i entered wrong reCAPTCHA setting (for example wrong Public Key, etc), i can not login to my WordPress site

Open your wp-login-recaptcha.php file. You can find it under your /wp-content/plugins/wp-login-recaptcha directory. Change this line

define('XRVEL_LOGIN_RECAPTCHA_ENABLED', true);

And modify it into

define('XRVEL_LOGIN_RECAPTCHA_ENABLED', false);

Refresh your login form, and reCAPTCHA will dissapear on your login form. You can login now and fix your reCAPTCHA setting from admin page.