Security Provider Help

Basically I have a user generated page that I only want the user who created it to be able to edit and anyone who isnt this user to be redirected, I assumed id something like the security identity but then on the enforcer how does this work, can I make this dynamic and in the future id like more than one user to be able to edit the page so the creator would give them a roll on their page (so here the security identity wouldn’t work as it only gets the creator) im just super lost on how to go about this.