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

NAME
     kerberos -- introduction to the Kerberos system

DESCRIPTION
     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
     http://www.nrl.navy.mil/CCS/people/kenh/kerberos-faq.html.

     For setup instructions see	the Heimdal Texinfo manual.

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

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.

     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 RFC1510 in
     1993. Since then much work	has been put into the further development, and
     a new RFC will hopefully appear soon.

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

HEIMDAL			       September 1, 2000		       HEIMDAL

NAME | DESCRIPTION | SEE ALSO | HISTORY

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