Password protection of a blog is possible, but it can be a bit of a challenge. The easiest way to password protect a blog is to use a password manager like LastPass or 1Password. These programs can help you create strong passwords and store them in an encrypted form. You can also use a password encrypting tool like BitLocker to encrypt your blog files.
Finally, you can add a password protection feature to your blog using a blogging platform like WordPress. This will allow you to create individual passwords for each post and store them in the WordPress database. When you want to access a post, you will need to enter the password that was assigned to it.