https://www.idmanagement.gov/
The Approved Products List (APL) provides federal agencies with products and services that have been approved for FICAM implementation based on rigorous security vulnerability and interoperability testing performed by the FIPS 201 Evaluation Program.
https://learn.microsoft.com/en-us/windows-server/identity/ad-ds/deploy/ad-ds-deployment
This guide covers how to install and remove Active Directory Domain Services (AD DS) in Windows Server 2012 and important issues to be aware of when you add new domain controllers to an existing Active Directory environment.
https://docs.redhat.com/en/documentation/red_hat_enterprise_linux/6/html/deployment_guide/ch-directory_servers
This link provides more information about using directory services within RedHat.
https://www.giac.org/paper/gsec/1852/network-security-authentication-applications-kerberos-public-key-infrastructure/103260
This document shows how to improve the security of a network through the use of authentication applications.
http://www.cs.tufts.edu/comp/116/archive/fall2015/agoldschmidt.pdf
This document provides a study of a unique class of attack and several methods attempting to prevent attacks of a kind.