Certified Ethical Hacker (CEH v13) — Question 110

As a cybersecurity consultant for SafePath Corp, you have been tasked with implementing a system for secure email communication. The key requirement is to ensure both confidentiality and non-repudiation. While considering various encryption methods, you are inclined towards using a combination of symmetric and asymmetric cryptography. However, you are unsure which cryptographic technique would best serve the purpose. Which of the following options would you choose to meet these requirements?

Answer options

• A. Apply asymmetric encryption with RSA and use the private key for signing.
• B. Use the Diffie-Hellman protocol for key exchange and encryption.
• C. Apply asymmetric encryption with RSA and use the public key for encryption.
• D. Use symmetric encryption with the AES algorithm.

Correct answer: A

Explanation

The correct answer is A because applying asymmetric encryption with RSA and using the private key for signing ensures both confidentiality and non-repudiation. Option B focuses on key exchange, which doesn't directly address email security requirements. Option C, while using RSA, does not fulfill non-repudiation, and option D only provides confidentiality without the non-repudiation aspect.