Homework Help is Here – Start Your Trial Now!
Engineering
Computer Science
(4 points) In this problem we will work through a round of DES. For notational simplicity, assume it is the first round. Please enter all answers as strings of 0's and 1's. The input is the 64 bit block 0000000000001000000000101000000000010000000000001000000000000000 Suppose that the subkey for the current round is this 48 bit number: 000010000000000000000000000000000000000000000000 What does the 64 bit state look like after the IP transformation is applied to the input? Now find Lo and Ro, the left and right halves of the state. Lo Ro = = 01001000100010000000001000 00000000000000000000000000 What is the result of applying the expansion box to Ro? E(RO) = 00000000000000000000000000000000000000 What is the result of XORing the subkey with E(RO)? k1 E(RO) == We now apply the S-box transformation. S(k1 E(RO)) = Finally we apply the permutation box to complete the function f. f(R0) = P(S(k₁ & E(R0))) = 010100 We can now compute the state of DES going into the next round. L1 = 0000000000000000000000000 R₁ 1110000110101010001111000

(4 points) In this problem we will work through a round of DES. For notational simplicity, assume it is the first round. Please enter all answers as strings of 0's and 1's. The input is the 64 bit block 0000000000001000000000101000000000010000000000001000000000000000 Suppose that the subkey for the current round is this 48 bit number: 000010000000000000000000000000000000000000000000 What does the 64 bit state look like after the IP transformation is applied to the input? Now find Lo and Ro, the left and right halves of the state. Lo Ro = = 01001000100010000000001000 00000000000000000000000000 What is the result of applying the expansion box to Ro? E(RO) = 00000000000000000000000000000000000000 What is the result of XORing the subkey with E(RO)? k1 E(RO) == We now apply the S-box transformation. S(k1 E(RO)) = Finally we apply the permutation box to complete the function f. f(R0) = P(S(k₁ & E(R0))) = 010100 We can now compute the state of DES going into the next round. L1 = 0000000000000000000000000 R₁ 1110000110101010001111000

Database System Concepts
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
See similar textbooks
icon
Related questions
Question

Provide the correct answers to each question

(4 points) In this problem we will work through a round of DES. For notational simplicity, assume it is the first round. Please enter all answers as strings of 0's and 1's. The input is the 64 bit block 0000000000001000000000101000000000010000000000001000000000000000 Suppose that the subkey for the current round is this 48 bit number: 000010000000000000000000000000000000000000000000 What does the 64 bit state look like after the IP transformation is applied to the input? Now find Lo and Ro, the left and right halves of the state. Lo Ro = = 01001000100010000000001000 00000000000000000000000000 What is the result of applying the expansion box to Ro? E(RO) = 00000000000000000000000000000000000000 What is the result of XORing the subkey with E(RO)? k1 E(RO) == We now apply the S-box transformation. S(k1 E(RO)) = Finally we apply the permutation box to complete the function f. f(R0) = P(S(k₁ & E(R0))) = 010100 We can now compute the state of DES going into the next round. L1 = 0000000000000000000000000 R₁ 1110000110101010001111000
Transcribed Image Text:(4 points) In this problem we will work through a round of DES. For notational simplicity, assume it is the first round. Please enter all answers as strings of 0's and 1's. The input is the 64 bit block 0000000000001000000000101000000000010000000000001000000000000000 Suppose that the subkey for the current round is this 48 bit number: 000010000000000000000000000000000000000000000000 What does the 64 bit state look like after the IP transformation is applied to the input? Now find Lo and Ro, the left and right halves of the state. Lo Ro = = 01001000100010000000001000 00000000000000000000000000 What is the result of applying the expansion box to Ro? E(RO) = 00000000000000000000000000000000000000 What is the result of XORing the subkey with E(RO)? k1 E(RO) == We now apply the S-box transformation. S(k1 E(RO)) = Finally we apply the permutation box to complete the function f. f(R0) = P(S(k₁ & E(R0))) = 010100 We can now compute the state of DES going into the next round. L1 = 0000000000000000000000000 R₁ 1110000110101010001111000
Expert Solution
steps

Step by step

Solved in 2 steps

SEE SOLUTIONCheck out a sample Q&A here
Blurred answer
Similar questions
  • SEE MORE QUESTIONS
Recommended textbooks for you
Database System Concepts
Database System Concepts
Computer Science
ISBN:
9780078022159
Author:
Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:
McGraw-Hill Education
Starting Out with Python (4th Edition)
Starting Out with Python (4th Edition)
Computer Science
ISBN:
9780134444321
Author:
Tony Gaddis
Publisher:
PEARSON
Digital Fundamentals (11th Edition)
Digital Fundamentals (11th Edition)
Computer Science
ISBN:
9780132737968
Author:
Thomas L. Floyd
Publisher:
PEARSON
C How to Program (8th Edition)
C How to Program (8th Edition)
Computer Science
ISBN:
9780133976892
Author:
Paul J. Deitel, Harvey Deitel
Publisher:
PEARSON
Database Systems: Design, Implementation, & Manag…
Database Systems: Design, Implementation, & Manag…
Computer Science
ISBN:
9781337627900
Author:
Carlos Coronel, Steven Morris
Publisher:
Cengage Learning
Programmable Logic Controllers
Programmable Logic Controllers
Computer Science
ISBN:
9780073373843
Author:
Frank D. Petruzella
Publisher:
McGraw-Hill Education
SEE MORE TEXTBOOKS