Certified Ethical Hacker (CEH v13) — Question 261

Alice needs to send a confidential document to her coworker, Bryan. Their company has public key infrastructure set up. Therefore, Alice both encrypts the message and digitally signs it. Alice uses _______________ to encrypt the message, and Bryan uses _______________ to confirm the digital signature.

Answer options

• A. Bryan’s public key; Bryan’s public key
• B. Alice’s public key; Alice’s public key
• C. Bryan’s private key; Alice’s public key
• D. Bryan’s public key; Alice’s public key

Correct answer: D

Explanation

The correct answer is D because Alice encrypts the document using Bryan's public key, ensuring only Bryan can decrypt it with his private key. Bryan then verifies Alice's digital signature using Alice's public key, confirming the authenticity of the message. The other options are incorrect because they either misstate which keys are used for encryption and signature verification or involve incorrect key usage.