5 minutes
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kerberos
There are various services that ensure authentication during logon. Examples of these are Java Authentication and Authorization Service and Kerberos.
Kerberos
Kerberos
Kerberos SESAME Active Directory
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http://en.wikipedia.org/wiki/Kerberos_(protocol) Why ask a question when you can more easily and quickly read the answer on wikipedia? This is true for a large majority of questions that start with "What is"
It's a mutual authentication; it verifies both user and sender of the ticket using symmetric keys.
Q5. Suppose an organization uses Kerberos for authentication. In terms of security and service availability, what is the effect if AS or TGS goes down?
Centralized file integrity protection!