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(b) Consider the following message: AS SOON AS SHE WAS which contains the individual characters: AS SOON AS SHE wAS Encrypt the message using a Vigenère cipher with the keyword: ALICE Show your working in detail.

(b) Consider the following message: AS SOON AS SHE WAS which contains the individual characters: AS SOON AS SHE wAS Encrypt the message using a Vigenère cipher with the keyword: ALICE Show your working in detail.

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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PART A Q1 (a) The following message was encrypted using a Caesar cipher with an unknown shift: V-IXZUBZ@VlaZYU-BB:la. The individual characters are: v- | !||x ||ZUBZ@v|| ! a || z||Y||U - ||B ||B:! a Decrypt the message. (Show your working in detail.) (b) Consider the following message: AS SOON AS SHE WAS which contains the individual characters: AS SOONAS SHE W AS Encrypt the message using a Vigenère cipher with the keyword: AL|CE Show your working in detail.
Transcribed Image Text:PART A Q1 (a) The following message was encrypted using a Caesar cipher with an unknown shift: V-IXZUBZ@VlaZYU-BB:la. The individual characters are: v- | !||x ||ZUBZ@v|| ! a || z||Y||U - ||B ||B:! a Decrypt the message. (Show your working in detail.) (b) Consider the following message: AS SOON AS SHE WAS which contains the individual characters: AS SOONAS SHE W AS Encrypt the message using a Vigenère cipher with the keyword: AL|CE Show your working in detail.
ALPHABET In all questions, you should work with an alphabet of n = 37 symbols, as indicated below. For individual symbols, you should use integer codes in the range 0 to 36 inclusive (therefore, you will be mainly using arithmetic modulo n = 37), as indicated by the following table: A в DEFG 0 1 JK 2 3 4 5 7 8 LM O P 14 15 Q|R S 10 11 12 13 16 17 18 19 TU 20 21 V. W Y ? 22 23 24 25 26 27 28 29 @ 30 31 32 33 34 35 36 So, for example, the symbol C should be encoded as the integer 3. Note: the space character (used to separate words) should be encoded by the integer 0.
Transcribed Image Text:ALPHABET In all questions, you should work with an alphabet of n = 37 symbols, as indicated below. For individual symbols, you should use integer codes in the range 0 to 36 inclusive (therefore, you will be mainly using arithmetic modulo n = 37), as indicated by the following table: A в DEFG 0 1 JK 2 3 4 5 7 8 LM O P 14 15 Q|R S 10 11 12 13 16 17 18 19 TU 20 21 V. W Y ? 22 23 24 25 26 27 28 29 @ 30 31 32 33 34 35 36 So, for example, the symbol C should be encoded as the integer 3. Note: the space character (used to separate words) should be encoded by the integer 0.
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