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Which physical security component incorporates nonrepudiation?
Contraband checks
Smart cards
Turnstiles
Security Guards
Correct answer and explanation: Smart cards incorporate a chip that contains private key portion of a public/private key pair and can be used to prove that one, and only that one person, could have performed specific actions. - The other answers do not allow for proving that a particular person carried out an action and therefore do not provide nonrepudiation. Contraband checks have little bearing on nonrepudiation. Turnstiles can help to fend off tailgating or piggybacking, which can help ensure some simple accountability, but would not meet the level of nonrepudiation. Security guards have many uses, and their testimony can prove extremely valuable, but, again, they do not provide for technical nonrepudiation in the way that smart cards do. ~ 11th Hour CISSP Study Guide, 2nd Edition, Page 184.
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