1. Encrypt the message "This is a secret message" using a monoalphabetic cipher. Also, decrypt the message "fsggash". 2. Consider the RSA algorithm with p a. What are n and z? - 7 and q = 13. b. Let e 17. Why is this value appropriate for e? c. Find d such that de 1 (mod z). d. Using the key (n, e), encrypt the message m = 9. Show the entire process and denote the encrypted result as c. 3. Suppose Alice wants to communicate with Bob using symmetric key encryption with a session key Ks. In this problem, we will see how the session key can be distributed through a Key Distribution Center (KDC) without using public key encryption. The KDC is a server that shares a unique secret symmetric key with each registered user. Let Alice's and Bob's symmetric keys with the KDC be KA-KDC and KB-KDC respectively. Design a method for distributing the session key K, to Alice and Bob using the KDC. Your method should use three messages: one from Alice to the KDC, one from the KDC to Alice, and one from Alice to Bob. The first message is KA-KDC(A, B). Using the symbols KA-KDC and KB-KDC answer the following: a. What is the second message? b. What is the third message?

1. Encrypt the message "This is a secret message" using a monoalphabetic cipher. Also, decrypt the message "fsggash". 2. Consider the RSA algorithm with p a. What are n and z? - 7 and q = 13. b. Let e 17. Why is this value appropriate for e? c. Find d such that de 1 (mod z). d. Using the key (n, e), encrypt the message m = 9. Show the entire process and denote the encrypted result as c. 3. Suppose Alice wants to communicate with Bob using symmetric key encryption with a session key Ks. In this problem, we will see how the session key can be distributed through a Key Distribution Center (KDC) without using public key encryption. The KDC is a server that shares a unique secret symmetric key with each registered user. Let Alice's and Bob's symmetric keys with the KDC be KA-KDC and KB-KDC respectively. Design a method for distributing the session key K, to Alice and Bob using the KDC. Your method should use three messages: one from Alice to the KDC, one from the KDC to Alice, and one from Alice to Bob. The first message is KA-KDC(A, B). Using the symbols KA-KDC and KB-KDC answer the following: a. What is the second message? b. What is the third message?

Computer Networking: A Top-Down Approach (7th Edition)

7th Edition

ISBN:9780133594140

Author:James Kurose, Keith Ross

Publisher:James Kurose, Keith Ross

Chapter1: Computer Networks And The Internet

Section: Chapter Questions

Problem R1RQ: What is the difference between a host and an end system? List several different types of end...

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