Craft 3 protecting a page with a password? I have used the Guest Entries to create a plugin where anonymous users can create a entry. I have a password field on each entry. Now I want the guests who have created the entry to be able to login with this password and edit the entry they created. I don't need user validation etc for this, just a single password. Is this possible in Craft 3?
I don't think this is possible with Craft out the box, and would require a module / plugin to add this functionality.

Firstly to write the password to the database and encrypt it, so it's not stored in plain text.

Then it would just be a case of having a controller (https://docs.craftcms.com/v3/extend/coding-guidelines.html#controllers) that checks this password from a form submission and unlocks the ability to edit the entry again.