Homework Help is Here – Start Your Trial Now!
Engineering
Computer Engineering
(c) Select one value that would be suitable and another that would not be suitable as an enciphering exponent for an Exponential Cipher with a modulus of 1927 (with prime factorisation 1927 = 41 x 47) from the following list 4, 5, 7, 8. Give reasons for your answers.

(c) Select one value that would be suitable and another that would not be suitable as an enciphering exponent for an Exponential Cipher with a modulus of 1927 (with prime factorisation 1927 = 41 x 47) from the following list 4, 5, 7, 8. Give reasons for your answers.

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...
See similar textbooks
icon
Related questions
Question
please send complete handwritten solution step by step please Q4 part c
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.
Q4 (a) Xavier has intercepted a ciphertext that was enciphered using a General Multplication-Shift Cipher, with a modulus of n = 231. Find o(n) and hence determine the number of ciphers that he might need to try if he uses a brute-force method to try to break the code. (b) Cassandra has intercepted a ciphertext that was enciphered using an Exponential Cipher, with a modulus of n = 4307. If she uses a brute-force approach, how many exponents might she have to try? (Note that the prime factorisation of 4307 is 59 x 73.) (c) Select one value that would be suitable and another that would not be suitable as an enciphering exponent for an Exponential Cipher with a modulus of 1927 (with prime factorisation 1927 = 41 x 47) from the following list 4, 5, 7, 8. Give reasons for your answers.
Transcribed Image Text:Q4 (a) Xavier has intercepted a ciphertext that was enciphered using a General Multplication-Shift Cipher, with a modulus of n = 231. Find o(n) and hence determine the number of ciphers that he might need to try if he uses a brute-force method to try to break the code. (b) Cassandra has intercepted a ciphertext that was enciphered using an Exponential Cipher, with a modulus of n = 4307. If she uses a brute-force approach, how many exponents might she have to try? (Note that the prime factorisation of 4307 is 59 x 73.) (c) Select one value that would be suitable and another that would not be suitable as an enciphering exponent for an Exponential Cipher with a modulus of 1927 (with prime factorisation 1927 = 41 x 47) from the following list 4, 5, 7, 8. Give reasons for your answers.
Expert Solution
steps

Step by step

Solved in 2 steps with 1 images

SEE SOLUTIONCheck out a sample Q&A here
Blurred answer
Recommended textbooks for you
Computer Networking: A Top-Down Approach (7th Edi…
Computer Networking: A Top-Down Approach (7th Edi…
Computer Engineering
ISBN:
9780133594140
Author:
James Kurose, Keith Ross
Publisher:
PEARSON
Computer Organization and Design MIPS Edition, Fi…
Computer Organization and Design MIPS Edition, Fi…
Computer Engineering
ISBN:
9780124077263
Author:
David A. Patterson, John L. Hennessy
Publisher:
Elsevier Science
Network+ Guide to Networks (MindTap Course List)
Network+ Guide to Networks (MindTap Course List)
Computer Engineering
ISBN:
9781337569330
Author:
Jill West, Tamara Dean, Jean Andrews
Publisher:
Cengage Learning
Concepts of Database Management
Concepts of Database Management
Computer Engineering
ISBN:
9781337093422
Author:
Joy L. Starks, Philip J. Pratt, Mary Z. Last
Publisher:
Cengage Learning
Prelude to Programming
Prelude to Programming
Computer Engineering
ISBN:
9780133750423
Author:
VENIT, Stewart
Publisher:
Pearson Education
Sc Business Data Communications and Networking, T…
Sc Business Data Communications and Networking, T…
Computer Engineering
ISBN:
9781119368830
Author:
FITZGERALD
Publisher:
WILEY
SEE MORE TEXTBOOKS