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Kerberos is freely available from MIT. It provides the tools of authentication and strong cryptography over the network to help secure information systems across an entire enterprise.
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Limitations of Kerberos
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Kerberos is not effective against password guessing attacks;
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To be useful, Kerberos must be integrated with other parts of the system.
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Kerberos does not itself provide authorization, but V5 Kerberos passes authorization information generated by other services. In this manner, Kerberos can be used as a base for building separate distributed authorization services.
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