Authentication is the method a computer uses to ensure that you are who you say you are.
Kerberos
Kerberos is a network authentication protocol. It is designed to provide strong authentication for client/server applications by using secret-key cryptography.
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One Time Passwords
This category concerns computer authentication systems that are based on single-use password schemes. These can include token-based solutions (like cryptocard) or pure-software solutions (like S/Key).
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Single Sign-On
Systems that allow access to multiple network resources with a single login.
OpenID,
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