Kerberos
Kerberos was created by Massachusetts Institute
of Technology as a solution to many network security problems. It is being
used in the MIT campus for reliability. The basic features of Kerberos
may be put as:
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It uses symmetric keys.
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Every user has a password ( key from it to the Authentication Server )
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Every application server has a password.
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The passwords are kept only in the Kerberos Database.
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The Servers are all physically secure.(No unauthorized user has access
to them.)
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The user gives the password only once.
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The password is not sent over the network in plain text or encrypted form.
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The user requires a ticket for each access.