1. Develop an attack tree for gaining access to customer account details from the database of a bank. 2. You are a junior IT executive at your department dealing with the DES encryption key. From the random key generator, you are given the secret key (E0E0E0E0F1F1F1F1)hex to encrypt a message. i. What is the output of the key after it is applied with the parity bit drop process box in Figure 1? At this point, is it a strong or weak key? Please state your reason. ii. Using the key-permutation compression 2 from Figure 2, decide whether this is a strong or weak key. Justify your answer. 57 49 41 33 25 17 01 58 50 42 34 26 18 10 02 59 51 43 35 27 19 03 60 52 44 36 63 55 47 39 31 23 15 07 62 54 46 38 30 22 14 06 61 53 45 37 29 21 13 05 28 20 12 04 Figure 1: Parity bit drop 14 17 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 Figure 2: Key-Permutation Compression 2

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
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1. Develop an attack tree for gaining access to customer account details from the
database of a bank.
2. You are a junior IT executive at your department dealing with the DES encryption
key. From the random key generator, you are given the
(EOE0E0E0F1F1F1F1)hex to encrypt a message.
secret key
i.
What is the output of the key after it is applied with the parity bit drop process
box in Figure 1? At this point, is it a strong or weak key? Please state your
reason.
Using the key-permutation compression 2 from Figure 2, decide whether this
is a strong or weak key. Justify your answer.
ii.
57
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Figure 1: Parity bit drop
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Figure 2: Key-Permutation Compression 2
Transcribed Image Text:1. Develop an attack tree for gaining access to customer account details from the database of a bank. 2. You are a junior IT executive at your department dealing with the DES encryption key. From the random key generator, you are given the (EOE0E0E0F1F1F1F1)hex to encrypt a message. secret key i. What is the output of the key after it is applied with the parity bit drop process box in Figure 1? At this point, is it a strong or weak key? Please state your reason. Using the key-permutation compression 2 from Figure 2, decide whether this is a strong or weak key. Justify your answer. ii. 57 49 33 25 17 09 58 50 42 34 26 18 10 02 59 51 43 35 27 19 03 60 52 44 36 63 55 47 39 31 23 15 07 62 54 46 38 30 22 14 06 61 53 45 37 29 21 13 05 28 20 12 04 Figure 1: Parity bit drop 14 17 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 Figure 2: Key-Permutation Compression 2
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