Exam 312-38 topic 1 question 462 discussion

Digital signatures: Digital signatures are used to verify the authenticity and integrity of digital documents or messages. A sender signs the data with their private key, and the recipient can use the sender's public key to verify the signature. If the data has been altered, the signature will not match. p.1581

Option A is the correct answer. Dan will use his digital signature to sign his emails, which will be created using his private key. Alex will use Dan's public key to verify the authenticity of the emails. This will ensure that the emails have not been tampered with and that they were indeed sent by Dan. Option B is incorrect because Alex cannot use his private key to verify the authenticity of Dan's emails. Digital signatures are created using the sender's private key, which can only be verified using the sender's public key. Option C is incorrect because encrypting the emails with a private key will only ensure confidentiality, not authenticity. Digital signatures are used to ensure the authenticity of the message. Option D is incorrect because encrypting the emails with a public key will only ensure confidentiality, not authenticity. Digital signatures are used to ensure the authenticity of the message.

Public Key is inside the digital certificate

C. Dan will use his private key to encrypt his mails while Alex will use his digital signature to verify the authenticity of the mails.