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Kerberos

2. . Assume an open distributed environment in which users at workstations wish to access services on servers distributed throughout the network.. 3. Threats: . A user may gain access to a particular workstation and pretend to be another user operating from that workstation.A user may eavesdrop o

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Kerberos

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    1. 1 Kerberos

    2. 2 Assume an open distributed environment in which users at workstations wish to access services on servers distributed throughout the network.

    3. 3 Threats: A user may gain access to a particular workstation and pretend to be another user operating from that workstation. A user may eavesdrop on exchanges and use a reply attack to gain entrance to a server or to disrupt operations. A user may alter the network address of a workstation so that the requests sent from the altered workstation appear to come from the impersonated workstation.

    4. 4 Kerberos: A secret key based service for providing authentication in open networks Authentication mediated by a trusted 3rd party on the network: Key Distribution Center (KDC)

    5. 5 Key Distribution At many points so far, we have run into problems with using cryptography for network security. How can we securely store and distribute key and password information? How can we certify that keys and password are safe and to be trusted? To solve these issues, we make use of a variety of trusted intermediaries.

    6. 6 Trusted Intermediaries Symmetric key problem: How do two entities establish shared secret key over network? Solution: trusted key distribution center (KDC) acting as intermediary between entities Public key problem: When Alice obtains Bobs public key (from web site, e-mail, diskette), how does she know it is Bobs public key, not Trudys? Solution: trusted certification authority (CA)

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