John Blackbourn

If you publish many password protected posts (or even if you don’t), you may end up using the same password for each one. With this plugin you can define a global password from your ‘Settings -> Global Post Password’ menu, and switch password protection on or off from the writing screen with just one click. Whenever you change the global password, all password protected posts are automatically updated with the new password.
Now whenever you write or edit a post or page you’ll be able to switch password protection on or off with one click, instead of having to manually type in a password each time. You can change the global password whenever you like from the ‘Settings -> Global Post Password’ menu.
Note that this plugin does not automatically enable password protection on every post. It allows you to use a global password for every post that you choose to password protect.
Please note that this plugin is no longer actively maintained. The global post password setting does not work with the block-based editor in WordPress and it’s unlikely that I’ll add support for it unless someone else volunteers to develop it. It does work with the “Classic” editor and with versions of WordPress prior to 5.0.

Global Post Password

Globally set a password for all password protected posts and pages.

Scott Reilly

NOTE: This plugin is no longer necessary as of WordPress 2.8 as this functionality is now built-in.
Prevent passworded posts from being included in site search results.
By default, WordPress’s built-in search feature searches the contents of passworded posts. If the content of a passworded post matches the search criteria, WordPress will include that post in the listing of search results. While it is true that the post contents will not be displayed to the visitor (unless they know and have entered the password for the post), the fact that the otherwise protected post appeared in the search results allows for the visitor to search-bomb your site in an effort to deduce some of the content of the password-protected post.
This plugin prevents posts that have a password from being included in any search performed on the site. Of course, external search (as done from Google) would never include the passworded post contents since that content is not available to external search engines.
This plugin does not constrain the search capabilities from within the WordPress admin.

Omit Passworded Posts From Search

Prevent passworded posts from being included in site search results.

Global Post Password vs Omit Passworded Posts From Search