Password Security through Negative Filtering

The purpose of an authentication system is to identify and verify incoming authentication requests comparing with some form of (stored) user identity. This stored user profile is at risk of being hacked and exploited by the attackers. The Negative Filtering or Negative Authentication (NA) approach utilizes a form of complement profiles which resembles the censoring and maturation process of T-cells in the immune system. The scope and applicability issues of this approach in the context of existing (positive) authentication systems have been discussed. The negative authentication is implemented using a real-valued negative selection algorithm. The performance of the technique along with security considerations has been analyzed and feasible configuration settings are reported.