Blogger Protector Lock v2013

Now, you can keep your posts inaccessible from unknown persons which requires some privacy. Yes! An extremely useful and secure script for password protecting blogger blogs has been introduced. The software hides whatever you want in the form of an encrypted code which can be revealed only if your users know the password to see the hidden content.

Its not only for blogger, you can use it on websites too. And of course you can Protect/Lock whatever you want not only posts.

http://www.extreme-social-media.com/2012/11/blogger-protector-lock-v2013.html