18.4.1. Protocol Explanation

Try these first

1. 1.

   What is symmetric key encryption?

   Hint

   Think about how keys work in locks.

2. 2.

   Who is an eavesdropper?

   Hint

   Consider who might be listening in on a conversation.

3. 3.

   What is defined by symmetric encryption?

   • Different keys for encryption and decryption
   • Same key for both encryption and decryption
   • Key is sent with the message

   Hint

   Recall how many keys are involved.

4. 4.

   True or False: Diffie-Hellman allows direct sharing of secret keys.

   • True
   • False

   Hint

   Think about the process of deriving a key.

5. 5.

   Explain a real-world application of the Diffie-Hellman protocol in online banking.

   Hint

   Consider how a bank and a user might establish secure communication.

6. 6.

   Analyze the impact of potential weaknesses in symmetric key encryption.

   Hint

   Consider the implications of a stolen key in a locked box scenario.