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+.\" Copyright (c) 2000 Kungliga Tekniska Högskolan
+.\" (Royal Institute of Technology, Stockholm, Sweden).
+.\" All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\"
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\"
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\"
+.\" 3. Neither the name of the Institute nor the names of its contributors
+.\"    may be used to endorse or promote products derived from this software
+.\"    without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\" $Id$
+.\"
+.Dd Jun 27, 2013
+.Dt KERBEROS 8
+.Os HEIMDAL
+.Sh NAME
+.Nm kerberos
+.Nd introduction to the Kerberos system
+.Sh DESCRIPTION
+Kerberos is a network authentication system. Its purpose is to
+securely authenticate users and services in an insecure network
+environment.
+.Pp
+This is done with a Kerberos server acting as a trusted third party,
+keeping a database with secret keys for all users and services
+(collectively called
+.Em principals ) .
+.Pp
+Each principal belongs to exactly one
+.Em realm ,
+which is the administrative domain in Kerberos. A realm usually
+corresponds to an organisation, and the realm should normally be
+derived from that organisation's domain name. A realm is served by one
+or more Kerberos servers.
+.Pp
+The authentication process involves exchange of
+.Sq tickets
+and
+.Sq authenticators
+which together prove the principal's identity.
+.Pp
+When you login to the Kerberos system, either through the normal
+system login or with the
+.Xr kinit 1
+program, you acquire a
+.Em ticket granting ticket
+which allows you to get new tickets for other services, such as
+.Ic telnet
+or
+.Ic ftp ,
+without giving your password.
+.Pp
+For more information on how Kerberos works, see the tutorial at
+.Lk https://kerberos.org/software/tutorial.html
+or the informal
+.Dq dialogue
+at
+.Lk https://web.mit.edu/kerberos/dialogue.html .
+.Pp
+For setup instructions see the Heimdal Texinfo manual.
+.Sh SEE ALSO
+.Xr ftp 1 ,
+.Xr kdestroy 1 ,
+.Xr kinit 1 ,
+.Xr klist 1 ,
+.Xr kpasswd 1 ,
+.Xr telnet 1 ,
+.Xr krb5 3 ,
+.Xr krb5.conf 5 ,
+.Xr kadmin 1 ,
+.Xr kdc 8 ,
+.Xr ktutil 1
+.Sh HISTORY
+The Kerberos authentication system was developed in the late 1980's as
+part of the Athena Project at the Massachusetts Institute of
+Technology. Versions one through three never reached outside MIT, but
+version 4 was (and still is) quite popular, especially in the academic
+community, but is also used in commercial products like the AFS
+filesystem.
+.Pp
+The problems with version 4 are that it has many limitations, the code
+was not too well written (since it had been developed over a long
+time), and it has a number of known security problems. To resolve many
+of these issues work on version five started, and resulted in IETF RFC
+1510 in 1993. IETF RFC 1510 was obsoleted in 2005 with IETF RFC 4120,
+also known as Kerberos clarifications. With the arrival of IETF RFC
+4120, the work on adding extensibility and internationalization have
+started (Kerberos extensions), and a new RFC will hopefully appear
+soon.
+.Pp
+This manual page is part of the
+.Nm Heimdal
+Kerberos 5 distribution, which has been in development at the Royal
+Institute of Technology in Stockholm, Sweden, since about 1997.