CAS-005 Question #341: Real Exam Question with Answer & Explanation

Question

An internal user can send encrypted emails successfully to all recipients, except one. at an external organization. When the internal user attempts to send encrypted emails to this external recipient, a security error message appears. The issue does not affect unencrypted emails. The external recipient can send encrypted emails to internal users. Which of the following is the most likely cause of the issue?

Options

• AThe validity dates of the external recipient's private key do not match the SSH keys with which the
• BThe external recipient has an expired public/private key pair that has not been revoked by the CA.
• CThe internal user's company email servers have an incorrect implementation of OCSP and CRL
• DThe external recipient's email address and the email address associated with the external

Explanation

In a Public Key Infrastructure (PKI) system, when sending encrypted emails, the recipient's public key is used for encryption. If the public key is associated with a different email address than the one being used by the recipient, the email encryption will fail, causing a security error. This is because the system is trying to encrypt the message using a public key that doesn't match the recipient's actual email address. Since the issue only occurs with one external recipient, and the internal user can send encrypted emails to all others, this suggests the problem is likely due to a mismatch between the email address and the public key used for encryption, rather than other potential issues like expired keys or incorrect settings.

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