Kerberos was originally developed for MIT's Project Athena in the 1980s and has grown to become the most widely deployed system for authentication and authorization in modern computer networks. Kerberos is currently shipped with all major computer operating systems and is uniquely positioned to become a universal solution to the distributed authentication and authorization problem of permitting universal "single sign-on" within and between federated enterprises and peer-to-peer communities. MIT has developed and maintains implementations of Kerberos software for the Apple Macintosh, Windows and Unix operating systems.
The current version of the Kerberos Software Documentation.
Read documents published by the MIT Kerberos Consortium: Publications
A guided tour of Kerberos: Tutorial
Links to additional Kerberos documentation resources: Useful Links