Authentication
Authentication is how a user is identified, typically through confidential information such as user name and password. Authentication ensures that users of hardware or software are who they say they are.
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Set up authentication features, such as a password system, in your platform operating systems to ensure that users are who they say they are.
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For user accounts: use access control lists where appropriate; set time-outs for extended sessions; set privilege levels for users.
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Ensure that your personnel use employee badges properly to enter the computer room.