Captcha in exchange for a password protection

Hi,

I wanted to create a blog that everyone could read the pagesin theory as it just uses a captcha instead of a password. I don’t wanna use password protection as it wouldn’t be very helpful for my purposes, but captcha would be perfect.

So far I only found captchas that protect comments. Does anyone know if there’s something like the thing I am looking for?

I hope you’Ve got some ideas for me! ??

Phil