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Suppose that you are the COMSEC - Communications Security custodian for a large, multinational corporation. Susie, from Finance approaches you in the break room saying that she lost her smart ID card that she uses to digitally sign and encrypt emails in the PKI. What happens to the certificates contained on the smart card after the security officer takes appropriate action?
Correct Answer: A
Explanation/Reference: Explanation: A certificate that is no longer trusted should be revoked. The CA is responsible for creating and handing out certificates, maintaining them, and revoking them if necessary. Revocation is handled by the CA, and the revoked certificate information is stored on a certificate revocation list (CRL). This is a list of every certificate that has been revoked. This list is maintained and updated periodically. A certificate may be revoked because the key holder's private key was compromised or because the CA discovered the certificate was issued to the wrong person. An analogy for the use of a CRL is how a driver's license is used by a police officer. If an officer pulls over Sean for speeding, the officer will ask to see Sean's license. The officer will then run a check on the license to find out if Sean is wanted for any other infractions of the law and to verify the license has not expired. The same thing happens when a person compares a certificate to a CRL. If the certificate became invalid for some reason, the CRL is the mechanism for the CA to let others know this information. Incorrect Answers: B: The certificates contained on the smart card should be revoked to invalidate the certificates. They should not be reissued; new certificates (with a different key) should be issued. C: New certificates (containing new keys) should be issued to the user. However, this question is asking about the certificates stored on the lost smart card. The certificates contained on the smart card should be revoked. D: It is not true that the user may no longer have certificates. New certificates with different keys can be issued to the user and the old certificates (the ones on the smart card) can be revoked. References: Harris, Shon, All In One CISSP Exam Guide, 6th Edition, McGraw-Hill, 2013, pp. 836-837