The following stream cipher operates on character A-Z one at a time. A character A-Z is mapped to Z26 ={0,1,2,.,25} in the usual way. For a key k e Z26, a key stream kıkzk3 .. is generated by the following rule:ki = k? +1 (mod 26), kin = k-1+n (mod 26).'n-1For a message m mim2...m,, where m; E Z26, the ciphertext c = c\C2...C, is calculated as followsCi= m;+ k;(mod 26)c. Encrypt the message WOLLONGONG with key = 3.%3Dd. Decrypt the ciphertext MQJJ with key = 3.%3D

To do: part C and D based on question

Answered: c. Encrypt the message WOLLONGONG with…

Engineering

Computer Engineering

c. Encrypt the message WOLLONGONG with key = 3. d. Decrypt the ciphertext MQJJ with key = 3. %3D

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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