Exam CAS-004 topic 1 question 460 discussion

Authenticate the sender.

A. non-repudiation. By signing an email, the sender can prove that they sent the message, as only they have access to the private key used to create the signature. This helps establish trust in the authenticity of the email and prevents the sender from denying having sent it. Additionally, email signatures can also contribute to D. Sender authentication, as they verify that the email came from a legitimate source, but non-repudiation is the more direct benefit associated with the use of email signatures.

I will be sure to look for the squares if this question doesnt say "Choose two" I chose A, but if it were obvious it was multiple than D is also a correct answer.

A,D is correct. If need to choose, I go with A. A. Non-repudiation: Email signatures ensure that the sender of the email cannot deny having sent the message. This is achieved through the use of digital signatures, which are created using the sender’s private key. If the recipient can verify the signature using the sender’s public key, it confirms that the email was indeed sent by the sender and has not been altered. D. Sender authentication: Digital email signatures authenticate the sender of the email. When an email is digitally signed, the recipient can verify that the email actually came from the purported sender by checking the digital signature against the sender’s public key. This helps in confirming the identity of the sender and ensuring that the email is from a legitimate source.

Is this multiple choice or single choice question?

Email signatures are primarily used to authenticate the sender of an email message, ensuring that the recipient can trust the origin of the message and detect any tampering during transmission. This helps mitigate risks associated with email spoofing and phishing attacks by providing assurance of sender identity.