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GSLC · Question #145

You work as a Network Administrator for Tech Perfect Inc. The company has a Windows Active Directory-based single domain single forest network. The functional level of the forest is Windows Server…

The correct answer is A. The recipient's public key. To ensure only the recipient can read a message, you encrypt it with the recipient's public key, which only their corresponding private key can decrypt.

Security Architecture & Engineering

Question

You work as a Network Administrator for Tech Perfect Inc. The company has a Windows Active Directory-based single domain single forest network. The functional level of the forest is Windows Server 2003. The company's headquarters is located at Los Angeles. A branch office of the company is located at Denver. You are about to send a message to Rick who is a Network Administrator at Denver. You want to ensure that the message cannot be read by anyone but the recipient. Which of the following keys will you use to encrypt the message?

Options

  • AThe recipient's public key
  • BYour private key
  • CThe recipient's private key
  • DYour public key

How the community answered

(15 responses)
  • A
    93% (14)
  • C
    7% (1)

Why each option

To ensure only the recipient can read a message, you encrypt it with the recipient's public key, which only their corresponding private key can decrypt.

AThe recipient's public keyCorrect

In asymmetric (public-key) cryptography, encrypting a message with the recipient's public key guarantees confidentiality because only the recipient holds the matching private key needed to decrypt it. This is the standard model for secure message exchange - the public key is freely shareable, while the private key remains secret with the owner. No other party, including the sender, can decrypt the message after encryption.

BYour private key

Your private key is used to create a digital signature for authentication and non-repudiation, not to encrypt a message for confidential delivery to another person.

CThe recipient's private key

You never have access to the recipient's private key - it is kept secret by the recipient and is never shared, making this option impossible.

DYour public key

Encrypting with your own public key would mean only your own private key could decrypt it, making the message unreadable to the intended recipient in Denver.

Concept tested: Asymmetric encryption for message confidentiality

Source: https://learn.microsoft.com/en-us/windows/win32/seccng/cryptographic-key-concepts

Topics

#asymmetric encryption#public key cryptography#message confidentiality#PKI

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