A recent email sent throughout the company stated that there would be a change in security policy. The security officer who was presumed to have sent the message stated the message was not sent from the security office and the company may be a victim of a spoofed email. What could have been added to the message to ensure the message actually came from the person?Select one:digital signaturenon-repudiationasymmetric keyhashing

The correct answer is a digital signature.

Here's why:

1. A digital signature is a mathematical scheme for verifying the authenticity of digital messages or documents. It is a type of asymmetric cryptography.

2. When a digital signature is used, it ensures that the message was not altered in transit (integrity) and verifies the sender's identity (authentication).

3. In this case, if the security officer had used a digital signature, it would have been possible to confirm that the email was indeed sent by him and not someone else.

4. Non-repudiation, asymmetric key, and hashing are all related to digital signatures and security, but they are not the direct answer to the question. Non-repudiation ensures that a party cannot deny the authenticity of their signature, an asymmetric key is a pair of keys used in encryption and decryption, and hashing is a function that converts an input into a fixed size string of bytes.

So, the addition of a digital signature to the email would have ensured that the message actually came from the security officer.