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Question 39 of 101
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A : a tag can be spoofed by anybody B : so for a shared key D : can only secure the communication but ensure the sender's identity C : good answer
1. Digital Signatures and Non-Repudiation: PKI provides the foundation for digital signatures. When a user sends a message, it's encrypted with their private key. The recipient can then use the sender's public key to decrypt it. This ensures: - Authenticity: The message truly originated from the claimed sender. - Non-repudiation: The sender cannot deny sending the message. - Integrity: The message hasn't been tampered with in transit. 2. How it prevents spoofing: Since only the sender has access to their private key, no one else can create a message that would decrypt correctly with their public key. This effectively prevents spoofing.
The "C" answer is either messed up on purpose, or somebody dumped it wrong. When you use PKI (Public Key Infrastructure), you encrypt using a _public_ key of the recipient, and the recipient decrypts using their _private_ key. Sample reference that this is correct: https://www.keyfactor.com/education-center/what-is-pki/ On the contrary, when a messages is _digitally signed_, the originator is using their _private_ key to sign the message, and the recipient is verifying it using _public key_ of the _originator_. I still don't know which answer would I choose on the actual exam.