18.4. Diffie-Hellman Key Exchange Protocol

Try these first

1. 1.

   What is the primary purpose of the Diffie-Hellman protocol?

   Hint

   Think about the scenario of sharing a secret over a public channel.

2. 2.

   What is the difference between a public key and a private key?

   Hint

   Consider who can access these keys.

3. 3.

   What two things do Sita and Ram share in the Diffie-Hellman protocol?

   • Public keys and private keys
   • Public keys only
   • Private keys only

   Hint

   Consider what they need to exchange during the protocol.

4. 4.

   The security of Diffie-Hellman relies on which problem?

   • Discrete logarithm problem
   • Simple addition problem

   Hint

   Which problem makes it hard for unauthorized users to derive keys?

5. 5.

   Explain a scenario where an attacker attempts to intercept the Diffie-Hellman key exchange and the potential outcomes.

   Hint

   Think about how private keys remain confidential despite public exchanges.

6. 6.

   Design a simple illustrative example of the Diffie-Hellman protocol where two parties choose specific values and calculate their shared secret.

   Hint

   Ensure calculations showcase both parties arriving at the same shared key through independent operations.