Node Security

Question 1

(1) Use the code book in page 170 of your textbook to decode this:

7227 1947 8008 6582

1939 1972 7834 2205

1287 1703 3887 2205

1287 8337 6582 5002

8913 3887 9136 2205

1287 8337 1972 9631

(2) What are the most important properties of public key encryption scheme? Build a PKI structure.

Question 2

  • If three keys K1, K2, and K3 were used to perform 3DES encryption and K1=K3, how many independent keys were actually involved? Why?
  • What is a nonce?
  • What is a key distribution center?

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