I have been working on Negative Authentication(NA) for the past year. NA is an approach that utilizes a form of complement profiles which resembles the censoring and maturation process of T-cells in the immune system.
Practically, NA is an additional invisible layer of password protection to the user. You can think of it as a mathematical plane that leaves small openings for the real passwords and blocks the rest.
In a way, Negative Authentication is a firewall for passwords, a way to detect the anti-passwords.
Below is a short video overview