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Kerberos

Kerberos. Short presentation Protocol run Ressources. By Artur Hecker, ENST Paris, 11/01/2002. Kerberos: general information. Based on Needham-Schroeder protocol Introduced by the MIT Uses only symmetric cryptography Shared secrets, session keys, timestamps, limited validity Purposes:

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Kerberos

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  1. Kerberos Short presentation Protocol run Ressources By Artur Hecker, ENST Paris, 11/01/2002

  2. Kerberos: general information • Based on Needham-Schroeder protocol • Introduced by the MIT • Uses only symmetric cryptography • Shared secrets, session keys, timestamps, limited validity Purposes: • Authentication • Session key distribution Preconditions: • Existence of a central instance with common keys for each party • All keys are pre-installed respectively ( shared secrets)

  3. time stamp validity period Alice knows K Notary Bob knows K Alice Bob 1 2 3 4 Kerberos: typical protocol run Problem: synchronized clocks

  4. Kerberos: Ressources • Jennifer G. Steiner, Clifford Neuman, Jeffrey I. Schiller. "Kerberos: An Authentication Service for Open Network Systems", USENIX Mar 1988.[athena-dist.mit.edu:pub/kerberos/doc/usenix.PS] • R. M. Needham and M. D. Schroeder, "Using Encryption for Authentication inLarge Networks of Computers", Communications of the ACM, Vol. 21(12), pp.993-999 (December, 1978). • Li Gong, "A Security Risk of Depending on Synchronized Clocks", OperatingSystems Review, Vol 26, #1, pp 49--53. • S.M. Bellovin and M. Merritt, "Limitations of the Kerberos AuthenticationSystem," USENIX Jan 1991. [research.att.com:dist/internet_security/kerblimit.usenix.ps] • C. Neuman and J. Kohl, "The Kerberos Network Authentication Service (V5)", RFC 1510, September 1993. • Kerberos Reference Page, [http://www.contrib.andrew.cmu.edu/usr/shadow/kerberos.html] • MIT Kerberos Ressources, [http://web.mit.edu/kerberos/www/]

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