Answered: M be the plaintext message M = MALAYSIA…

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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Question

1. Let M be the plaintext message M = MALAYSIA and the private key, K = ISSOGOOD a) Using the appropriate steps of DES operation, what is the final output of the key for round 1 (hint: you have to use the circular left shift and permutation compression (PC) table provided below). b) For round 1, please provide your output for the XOR operation of plaintext and the key, according to the DES operation. c) Based on the output of 4(b), explain the next process using the S-box table, and show the output from this operation. d) Based on the output of 4(c), explain the next process using a straight permutation table, and show the output from this operation.

S-Box Table
s1
1e
12
S2
15
S3
13
13
1 1e
13
54
13
10
S6
S7
11
S8
13
1 15
13
1e
7.
11
2.
1
14
11
Straight Permutation Table
16
07
21
01
15
26
02
08
14
27
19
13
06
11
AN 00
2O27
iname
inonm
00
munoo
IN
NHN 00

Key Permutation-Compression Table
14
17
11
24
01
05
03
28
15
06
21
10
23
19
12
04
26
08
16
07
27
20
13
02
41
52
31
37
47
55
30
40
51
45
33
48
44
49
39
56
34
53
46
42
50
36
29
32

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