(a) Consider the following message: SO THEY GOT THEIR It contains the individual characters: SOTHEY GOTITHEOR Group the letters into k-graphs with k = 2 (padding with extra spaces if needed). Encrypt the message using a Multiplication-Shift cipher with multiplier a = 53 and shift b = 11. Hint: when using k-graphs, remember to use arithmetic modulo N = n", where n is the size of your alphabet. (Show your working in detail.) (b) Let a = 355, M = 74896. Show that gcd(a, M) = 1. Hence find the mutliplicative inverse, %3D a- mod M. Show your working. (c) The following integers: 1090 1158 37 || 80 | 771 434 438 876 573 142 represent k-graphs with k = 2 (padded with extra spaces if needed) of a message that was %3D encrypted using a Multiplication-Shift cipher, with multiplier a = 49 and shift b = 31. Decrypt the %3D message. (Show your working in detail.)
(a) Consider the following message: SO THEY GOT THEIR It contains the individual characters: SOTHEY GOTITHEOR Group the letters into k-graphs with k = 2 (padding with extra spaces if needed). Encrypt the message using a Multiplication-Shift cipher with multiplier a = 53 and shift b = 11. Hint: when using k-graphs, remember to use arithmetic modulo N = n", where n is the size of your alphabet. (Show your working in detail.) (b) Let a = 355, M = 74896. Show that gcd(a, M) = 1. Hence find the mutliplicative inverse, %3D a- mod M. Show your working. (c) The following integers: 1090 1158 37 || 80 | 771 434 438 876 573 142 represent k-graphs with k = 2 (padded with extra spaces if needed) of a message that was %3D encrypted using a Multiplication-Shift cipher, with multiplier a = 49 and shift b = 31. Decrypt the %3D message. (Show your working in detail.)
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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