Question

Which of the following methods provides a one-time session key for two parties?

• A. Diffie-Hellman
• B. RSA
• C. DES
• D. AES

Hint:

Diffie-Hellman key exchange is widely used in secure communication protocols such as TLS/SSL and VPNs to establish a shared secret key without transmitting it directly.

Answer 1

The Correct Option is A

Step 1: Understanding One-Time Session Key Exchange A one-time session key is used for secure communication between two parties, preventing unauthorized access.
Step 2: Analyzing the Given Options
- Diffie-Hellman (Correct Answer): The Diffie-Hellman key exchange is specifically designed to establish a shared secret key between two parties over an insecure channel.
- RSA: RSA is primarily used for encryption and digital signatures rather than session key generation.
- DES: DES (Data Encryption Standard) is a symmetric encryption algorithm, not a key exchange mechanism.
- AES: AES (Advanced Encryption Standard) is also a symmetric encryption algorithm and does not generate session keys dynamically.