[Plugin: Really Simple Captcha] On default WordPress login/register page?

I am currently using contact form 7 and am looking to use the same captcha across the board (ie, contact form 7, comments, login and registration page). I have it set up for contact form 7 and I have downloaded and installed cbnet Really Simple Captcha and have it working on my comments. Is there another plugin that allows it to work with the default login/registration page or is there a way to make it work?