Question 1 (2 ✔Listen ► The phrase "BLACK HAT" was encrypted using a shift cipher, resulting in the cipher text "WGVXFCVO". Select all the shift ciphers that could have been used to encrypt the phrase. f(p) = (p +21) mod 26 f(p) = (p - 5) mod 26 f(p) = (p+19) mod 26 Of(p) = (p-31) mod 26 Question 2 ( Listen Select all the keys (a, b) that make the affine transformation f(p) = (ap + b) mod 26 valid. (1,26) [](7,-5) (13, 9) (50, 3) Question 3 (. Listen ► Encrypt the message "REDS HACKED BLUES" using the block cipher defined by • σ(1) = 3 • σ(2) = 5 . • σ(3) = 1 • σ(4) = 7 • σ(5) = 2 • σ(6) = 4 • σ(7) = 6 Type your answer using UPPERCASE, and omit spaces. Question 4 (2 Listen True or False: "The receiver of a message encrypted with RSA key (n = p*q, e) knows what the integers p and q are." True False Question 5 ✔Listen Which of the following is the decryption function for the RSA key (8633, 13)? HINT: 8633= 97*89 O A/ O 3317 f¹(c) = c³3¹7 mod 8624 f¹(c) = c³3¹7 mod 8633 f¹(c) = c¹3 mod 8633 f-¹(c) = c³217 mod 8624

Question 1 (2 ✔Listen ► The phrase "BLACK HAT" was encrypted using a shift cipher, resulting in the cipher text "WGVXFCVO". Select all the shift ciphers that could have been used to encrypt the phrase. f(p) = (p +21) mod 26 f(p) = (p - 5) mod 26 f(p) = (p+19) mod 26 Of(p) = (p-31) mod 26 Question 2 ( Listen Select all the keys (a, b) that make the affine transformation f(p) = (ap + b) mod 26 valid. (1,26) [](7,-5) (13, 9) (50, 3) Question 3 (. Listen ► Encrypt the message "REDS HACKED BLUES" using the block cipher defined by • σ(1) = 3 • σ(2) = 5 . • σ(3) = 1 • σ(4) = 7 • σ(5) = 2 • σ(6) = 4 • σ(7) = 6 Type your answer using UPPERCASE, and omit spaces. Question 4 (2 Listen True or False: "The receiver of a message encrypted with RSA key (n = pq, e) knows what the integers p and q are." True False Question 5 ✔Listen Which of the following is the decryption function for the RSA key (8633, 13)? HINT: 8633= 9789 O A/ O 3317 f¹(c) = c³3¹7 mod 8624 f¹(c) = c³3¹7 mod 8633 f¹(c) = c¹3 mod 8633 f-¹(c) = c³217 mod 8624

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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