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13- Encrypt the message WATCH YOUR STEP by translating the letters into numbers, applying the given encryption function, and then translating the numbers back into letters. a) f(p) = (p + 14) mod 26 b) f(p) = (-7p + 1) mod 26

13- Encrypt the message WATCH YOUR STEP by translating the letters into numbers, applying the given encryption function, and then translating the numbers back into letters. a) f(p) = (p + 14) mod 26 b) f(p) = (-7p + 1) mod 26

Computer Networking: A Top-Down Approach (7th Edition)
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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13- Encrypt the message WATCH YOUR STEP by translating the letters into numbers, applying the given encryption function, and then translating the numbers back into letters. a) f(p) = (p + 14) mod 26 b) f(p) = (-7p + 1) mod 26 14- The following message has been encrypted using the Caesar cipher with key 22: ΥΗΚΟΑ PDA ZKKN. Decrypt it. 15- Prove that for every positive integer n : 1·2·3 + 2· 3 · 4+. . +n(n +1)(n + 2) = n(n + 1)(n + 2)(n + 3)/4 16- Prove that for every positive integer n and all real number r except 1: -1 r -1 i=0 17- Show that n! > 3 n for n > 7 (using mathematical Induction )?
Transcribed Image Text:13- Encrypt the message WATCH YOUR STEP by translating the letters into numbers, applying the given encryption function, and then translating the numbers back into letters. a) f(p) = (p + 14) mod 26 b) f(p) = (-7p + 1) mod 26 14- The following message has been encrypted using the Caesar cipher with key 22: ΥΗΚΟΑ PDA ZKKN. Decrypt it. 15- Prove that for every positive integer n : 1·2·3 + 2· 3 · 4+. . +n(n +1)(n + 2) = n(n + 1)(n + 2)(n + 3)/4 16- Prove that for every positive integer n and all real number r except 1: -1 r -1 i=0 17- Show that n! > 3 n for n > 7 (using mathematical Induction )?
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