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KERBEROS(8)		  BSD System Manager's Manual		   KERBEROS(8)

     kerberos -- introduction to the Kerberos system

     Kerberos is a network authentication system. Its purpose is to securely
     authenticate users	and services in	an insecure network environment.

     This is done with a Kerberos server acting	as a trusted third party,
     keeping a database	with secret keys for all users and services (collec-
     tively called principals).

     Each principal belongs to exactly one 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.

     The authentication	process	involves exchange of `tickets' and
     `authenticators' which together prove the principal's identity.

     When you login to the Kerberos system, either through the normal system
     login or with the kinit(1)	program, you acquire a ticket granting ticket
     which allows you to get new tickets for other services, such as telnet or
     ftp, without giving your password.

     For more information on how Kerberos works, and other general Kerberos
     questions see the Kerberos	FAQ at

     For setup instructions see	the Heimdal Texinfo manual.

     ftp(1), kdestroy(1), kinit(1), klist(1), kpasswd(1), telnet(1)

     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.

     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.

     This manual page is part of the Heimdal Kerberos 5	distribution, which
     has been in development at	the Royal Institute of Technology in Stock-
     holm, Sweden, since about 1997.

HEIMDAL			       September 1, 2000		       HEIMDAL


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