Exam SY0-601 topic 1 question 105 discussion

Professor Messer notes • Non-Repudiation – Confirm the authenticity of data – Digital signature provides both integrity and non-repudiation

A. Non-repudiation

Another question where it could be A OR D. AGHH

When a user signs an email using their private key in a public key infrastructure (PKI) or digital signature system, it assures non-repudiation. Non-repudiation means that the sender of the email cannot later deny having sent it. The digital signature, created with the private key, provides cryptographic proof of the sender's identity and the integrity of the message, making it difficult for the sender to disavow the message's authenticity. Authentication: While email signing does provide authentication, the term "non-repudiation" more specifically relates to the sender's inability to deny the message, which is the primary focus of digital signatures.

the assurance provided is Authentication Email signing using a private key allows the recipient to verify the sender's identity and ensure that the email has not been tampered with during transit. This provides authentication and verifies the sender's identity. Non-repudiation is also related to digital signatures, but it assures that the sender cannot deny sending the message, which is a separate concept from authentication

When a user signs an email using a private key, the assurance provided is Authentication Email signing using a private key allows the recipient to verify the sender's identity and ensure that the email has not been tampered with during transit. This provides authentication and verifies the sender's identity. Non-repudiation is also related to digital signatures, but it assures that the sender cannot deny sending the message, which is a separate concept from authentication. Confidentiality and availability are not directly related to email signing with a private key.

Non-repudiation is a legal concept that's widely used in information security and refers to a service, which provides proof of the origin and integrity of data. A, No?

In the chapter for digital signatures in CompTIA's Certmaster Learn for Security+, only authentication and integrity are mentioned. I don't doubt non-repudiation is also proved (a later page even states non-repudiation is linked to authentication), but I'm going to go with authentication here.

When a user signs an email using a private key, it provides assurance of non-repudiation. Non-repudiation is the property that ensures the sender of a message cannot deny sending it. By signing the email with their private key, the sender creates a digital signature that can only be decrypted and verified with their corresponding public key. This process ensures that the sender's identity is authenticated and cannot be denied later, providing non-repudiation.

It could be A or It could be D. Another Comptia-esque question. Looking at Messer's notes for section 2.8 he states that Non-Repudiation can authentic and provides integrity

D. Authentication is assured when a user signs an email using a private key. When a user signs an email using a private key, it provides a digital signature that verifies the authenticity of the email and the sender. This process ensures that the recipient can be confident that the email is from the claimed sender, and that the message has not been tampered with during transit. Authentication is the process of verifying the identity of a user or entity, and in this case, the digital signature provides this verification. Therefore, the correct answer is D. Authentication. Note that signing an email with a private key does not necessarily provide confidentiality (B) or availability (C), as these are separate aspects of information security that require different measures to achieve. Non-repudiation (A) is related to authentication, but it refers specifically to the inability of the sender to deny having sent the message once it has been signed with their private key.

when a sender signs a message with their private key, they guarantee the message's authenticity, illustrating that they were indeed the message's source. And in this way, the sender's public key, which the recipient has access to, is the sole method of decrypting the sender's message. After the Email is sent then "A".

It seems answer D. Non-repudiation. The sender cannot later deny sending the message. This is sometimes required with online transactions. For example, imagine Homer sends an order to sell stocks using a digitally signed email. If the stocks increase after his sale completes, he can’t deny the transaction. Source: Darill Gibson, CompTIA Security+:Get Certified Get Ahead SY0-501 Study Guide

Message signing, on the other hand, uses the sender's private key to sign the message, and his or her public key is used to read the signature. Message signing helps ensure data integrity, message authentication, and non-repudiation. So Option A and D both are correct. :)

I agree that its A. However, it states "what is assured when a user signs an email..", it doesnt say if it was sent. Just that it was signed. CompTIA is more than likely going to do answer D. Knowing them, they'd do that.

A. Non-repudiation. It is a concept that the sender cannot deny that they sent the message.

Non Repudiation is your virtual John Hancock. It's a way of virtually stamping any data or document with "I am who I say I am". Only way to break this would be if the private key owners' private key became compromised. Which at that point you got bigger problems than Non Repudiation.