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computer science crazy
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22-09-2008, 09:33 AM

In a non-networked personal computing environment resources and information can be protected by physically securing the personal computer. But in a network of users requiring services from many computers the identity of each user has to be accurately verified. For authentication kerberos is being used. Kerberos is a third party authentication technology used to identify a user requesting a service.
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21-03-2012, 01:06 PM


.docx   kerberos project report.docx (Size: 148.53 KB / Downloads: 41)


Kerberos is a computer network authentication protocol which works on the basis of "tickets" to allow nodes communicating over a non-secure network to prove their identity to one another in a secure manner. Its designers aimed primarily at a client–server model, and it provides mutual authentication — both the user and the server verify each other's identity. Kerberos protocol messages are protected against eavesdropping and replay attacks. Kerberos builds on symmetric key cryptography and requires a trusted third party, and optionally may use public-key cryptography by utilizing asymmetric key cryptography during certain phases of authentication .Kerberos uses port 88 by default.
The following abbreviations are used:
--AS = Authentication Server
--SS = Service Server
--TGS = Ticket-Granting Server
--TGT = Ticket Granting Ticket

MIT eveloped Kerberos to protect network services provided by Project Athena. The protocol was named after the Greek mythological character Kerberos (or Cerberus), known in Greek mythologyas being the monstrous three-headed guard dog of Hades. Several versions of the protocol exist; versions 1–3 occurred only internally at MIT. Steve Miller and Clifford Neuman, the primary designers of Kerberos version 4, published that version in the late 1980s, although they had targeted it primarily for Project Athena. Version 5, designed by John Kohl and Clifford Neuman, appeared as RFC 1510 in 1993 (made obsolete by RFC 4120 in 2005), with the intention of overcoming the limitations and security problems of version 4.MIT makes an implementation of Kerberos freely available, under copyright permissions similar to those used for BSD. In 2007, MIT formed the Kerberos Consortium to foster continued development. Founding sponsors include vendors such as Oracle, Apple Inc., Google, Microsoft and Centrify Corporation, and academic institutions such as KTH-Royal Institute of Technology, Stanford University, MIT and vendors such as CyberSafe offering commercially supported versions.There are two versions of Kerberos currently in use, version 4 and version 5

2.4.1 NTP:-
NTP server is Network Time Protocol used for synchronize time in the network. So every host
in network has same time or sync with each other.NTP is an Internet standard protocol originally
developed by Professor David L. Mills at the University of Delaware.

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