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EC-Council

312-50V10 · Question #916

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

The correct answer is C. Dorian is signing the message with his private key. and Poly will verify that the message came. A sender creates a digital signature using their own private key, and the recipient verifies it using the sender's public key to confirm both authenticity and message integrity.

Cryptography

Question

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

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

How the community answered

(28 responses)
  • A
    4% (1)
  • B
    4% (1)
  • C
    86% (24)
  • D
    7% (2)

Why each option

A sender creates a digital signature using their own private key, and the recipient verifies it using the sender's public key to confirm both authenticity and message integrity.

ADorian is signing the message with his public key. and Poly will verify that the message came

Public keys cannot create digital signatures - they are used for encryption and signature verification only, making this option cryptographically invalid.

BDorian Is signing the message with Polys public key. and Poly will verify that the message came

Signing with Polly's public key does not associate the message with Dorian's identity and provides no cryptographic proof that the message came from Dorian.

CDorian is signing the message with his private key. and Poly will verify that the message cameCorrect

Dorian signs the email with his own private key, producing a cryptographic signature that only his private key could have generated, uniquely binding the message to his identity. Polly verifies the signature using Dorian's public key, confirming the message originated from Dorian and was not altered after signing.

DDorian is signing the message with Polys private key. and Poly will verify mat the message came

Polly's private key is her exclusive secret credential and is never shared - using it to sign Dorian's message would be a security violation and cannot prove Dorian is the sender.

Concept tested: Asymmetric key usage in digital signature creation and verification

Source: https://learn.microsoft.com/en-us/windows/win32/seccrypto/digital-signatures

Topics

#digital signature#private key signing#public key verification#asymmetric cryptography

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