I’ve got only one function left that I need to solve (if it’s solvable).

I’ve got a frontend post system for unregistered users.
But there are no way for the users to delete a post if they later want.

So I was thinking, if I in my form (where they create their post), ask them to write a password in a custom field, is there then anyway to delete the post by using the post id nr and the password they provided?

.. Or is this completely impossible?

The reason I want this is because currently no front-end custom poster plugins have any preview function, and maybe the user did something wrong and they want to do another post..