Dorian Is sending a digitally signed email to Polly, with which key is Dorian signing this message and how is Poly validating It?

Question

Options

• ADorian is signing the message with his public key. and Poly will verify that the message came
• BDorian Is signing the message with Polys public key. and Poly will verify that the message came
• CDorian is signing the message with his private key. and Poly will verify that the message came
• DDorian is signing the message with Polys private key. and Poly will verify mat the message came

• A
  3% (1)
• C
  93% (28)
• D
  3% (1)

Explanation

Digital Signatures Explained

Option C is correct because in digital signing, the sender (Dorian) always signs with their own private key - this proves the message came from Dorian, since only he possesses his private key. Polly then uses Dorian's public key (which is freely available) to verify the signature, confirming authenticity and integrity.

Why the distractors are wrong:

• A is incorrect because public keys are not kept secret and cannot prove identity - anyone could sign with a public key
• B is incorrect because using Polly's public key describes encryption (keeping content secret), not signing
• D is incorrect because Dorian would never have access to Polly's private key, and using it would prove nothing about Dorian's identity

Memory Tip: Think of a digital signature like a wax seal on a letter - you stamp it with your own unique seal (private key) so others can recognize it as yours. Remember the phrase: "Sign with MINE, verify with THEIRS" - the sender signs with their private key, and the receiver verifies with the sender's public key.

No community discussion yet for this question.