Suppose Alice wants to communicate with Bob using symmetric key cryptography using a session key KS. In

Question:

Suppose Alice wants to communicate with Bob using symmetric key cryptography using a session key KS. In Section 8.2, we learned how public-key cryptography can be used to distribute the session key from Alice to Bob. In this problem, we explore how the session key can be distributed-without public key cryptography-using a key center (KDC). The KDC is a server that shares a unique secret symmetric key with each registered user. For Alice and Bob, denote these keys by KA-KDC and KB-KDC Design a scheme that uses the KDC to distribute Ks to Alice and Bob. Your scheme should use three messages to distribute the session key: a message from Alice to the KDC; a message from the KDC to Alice; and finally a message from Alice to Bob. The first message is K A.KDC (A, B). Using the notation, KA-KDC' KB-KDC' S, A, and B answer the following questions.
a. What is the second message?
b. What is the third message?
Distribution
The word "distribution" has several meanings in the financial world, most of them pertaining to the payment of assets from a fund, account, or individual security to an investor or beneficiary. Retirement account distributions are among the most...