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Question 1114 - CISA discussion

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An organization uses public key infrastructure (PKI) to provide email security. Which of the following would be the MOST efficient method to determine whether email messages have been modified in transit?

A.
The message is encrypted using a symmetric algorithm.
Answers
A.
The message is encrypted using a symmetric algorithm.
B.
The message is sent using Transport Layer Security (TLS) protocol.
Answers
B.
The message is sent using Transport Layer Security (TLS) protocol.
C.
The message is sent along with an encrypted hash of the message.
Answers
C.
The message is sent along with an encrypted hash of the message.
D.
The message is encrypted using the private key of the sender.
Answers
D.
The message is encrypted using the private key of the sender.
Suggested answer: C

Explanation:

This method is known as creating a digital signature of the message. It ensures the integrity of the message by verifying that it has not been tampered with in transit. The process involves hashing the message and encrypting the hash value with the sender's private key.Any changes to the message will result in a different hash value1.This method is used in DomainKeys Identified Mail (DKIM), which verifies an email's domain and helps show that the email has not been tampered with in transit2.

Understanding Digital Signatures | CISA

Using DomainKeys Identified Mail (DKIM) in your organisation

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asked 18/09/2024
Everardo Gonzalez
34 questions
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