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Question 30 - 212-81 discussion

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A list of certificates that have been revoked.

A.
CA
Answers
A.
CA
B.
CRL
Answers
B.
CRL
C.
PCBC
Answers
C.
PCBC
D.
OCSP
Answers
D.
OCSP
Suggested answer: B

Explanation:

CRL

https://en.wikipedia.org/wiki/Certificate_revocation_list

In cryptography, a certificate revocation list (or CRL) is 'a list of digital certificates that have been revoked by the issuing certificate authority (CA) before their scheduled expiration date and should no longer be trusted'.

Incorrect answers:

PCBC - the propagating cipher block chaining or plaintext cipher-block chaining mode was designed to cause small changes in the ciphertext to propagate indefinitely when decrypting, as well as when encrypting. In PCBC mode, each block of plaintext is XORed with both the previous plaintext block and the previous ciphertext block before being encrypted. As with CBC mode, an initialization vector is used in the first block.

CA - certificate authority or certification authority is an entity that issues digital certificates.

OCSP - The Online Certificate Status Protocol (OCSP) is an Internet protocol used for obtaining the revocation status of an X.509 digital certificate. It is described in RFC 6960 and is on the Internet standards track. It was created as an alternative to certificate revocation lists (CRL), specifically addressing certain problems associated with using CRLs in a public key infrastructure (PKI).

asked 18/09/2024
ANNA RIBALTA
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