16.3.3. Analogy of Padlock

Try these first

1. 1.

   What is a public key?

   Hint

   Think about the padlock analogy.

2. 2.

   Describe symmetric key cryptography.

   Hint

   Consider how it differs from public key cryptography.

3. 3.

   What is the primary function of a public key?

   • To lock data
   • To unlock data
   • To create keys

   Hint

   Remember the padlock analogy.

4. 4.

   Is the Diffie-Hellman protocol secure in any situation?

   • True
   • False

   Hint

   Consider the implications of asynchronicity.

5. 5.

   Design a hypothetical public key cryptosystem and outline its strengths and weaknesses.

   Hint

   Think about how keys are shared and the potential weaknesses like replay attacks.

6. 6.

   Explain how the protocol could be compromised and suggest security measures.

   Hint

   Consider what makes a public channel vulnerable.