Hmm... the title of this article  is very revolutionary. However, there is something really wrong with (mis)using wrongly designed discriminant analysis for authentication purposes. The Russian chemometric team discusses authentication concept, disadvantages of discriminant methods and recommends one-class classifiers for this task.
- O.Y. Rodionova, A.V. Titova, and A.L. Pomerantsev, "Discriminant analysis is an inappropriate method of authentication", TrAC Trends in Analytical Chemistry, vol. 78, pp. 17-22, 2016. http://dx.doi.org/10.1016/j.trac.2016.01.010