Welcome to the Data Encryption Standard MCQs Page

Dive deep into the fascinating world of Data Encryption Standard with our comprehensive set of Multiple-Choice Questions (MCQs). This page is dedicated to exploring the fundamental concepts and intricacies of Data Encryption Standard, a crucial aspect of Cryptography and Network Security. In this section, you will encounter a diverse range of MCQs that cover various aspects of Data Encryption Standard, from the basic principles to advanced topics. Each question is thoughtfully crafted to challenge your knowledge and deepen your understanding of this critical subcategory within Cryptography and Network Security.

Check out the MCQs below to embark on an enriching journey through Data Encryption Standard. Test your knowledge, expand your horizons, and solidify your grasp on this vital area of Cryptography and Network Security.

Note: Each MCQ comes with multiple answer choices. Select the most appropriate option and test your understanding of Data Encryption Standard. You can click on an option to test your knowledge before viewing the solution for a MCQ. Happy learning!

Data Encryption Standard MCQs | Page 2 of 4

Explore more Topics under Cryptography and Network Security

01

Cryptography Basics

02

Encryption Techniques

03

Number Theory and Finite Fields

04

Advanced Encryption Algorithm

05

Pseudorandom Number Generation and Stream Ciphers

06

Public Key Cryptography and RSA

07

Cryptographic Hash Functions

08

Message Authentication Codes and Key Management

09

Network Security Concepts

10

Security in the Internet

11

Wireless Network Security

Q11.

The DES Algorithm Cipher System consists of ____________rounds (iterations) each with a round key

Discuss

Answer: (d).16

Q12.

The DES algorithm has a key length of

128 Bits

32 Bits

64 Bits

16 Bits

Discuss

Answer: (c).64 Bits

Q13.

In the DES algorithm, although the key size is 64 bits only 48bits are used for the encryption procedure, the rest are parity bits.

True

False

May be

Can't say

Discuss

Answer: (b).False

Q14.

In the DES algorithm the round key is __________ bit and the Round Input is ____________bits.

48, 32

64,32

56, 24

32, 32

Discuss

Answer: (a).48, 32

Q15.

In the DES algorithm the Round Input is 32 bits, which is expanded to 48 bits via ____________

Scaling of the existing bits

Duplication of the existing bits

Addition of zeros

Addition of ones

Discuss

Answer: (a).Scaling of the existing bits

Q16.

The Initial Permutation table/matrix is of size

16×8

12×8

8×8

4×8

Discuss

Answer: (c).8×8

Q17.

The number of unique substitution boxes in DES after the 48 bit XOR operation are

Discuss

Answer: (a).8

Q18.

In the DES algorithm the 64 bit key input is shortened to 56 bits by ignoring every 4th bit.

True

False

May be

Can't say

Discuss

Answer: (b).False

Q19.

During decryption, we use the Inverse Initial Permutation (IP-1) before the IP.

True

False

May be

Can't say

Discuss

Answer: (a).True

Q20.

A preferable cryptographic algorithm should have a good avalanche effect.

True

False

May be

Can't say

Discuss

Answer: (a).True

Page 2 of 4

Welcome to the Data Encryption Standard MCQs Page

Data Encryption Standard MCQs | Page 2 of 4

Explore more Topics under Cryptography and Network Security

Cryptography Basics

Encryption Techniques

Number Theory and Finite Fields

Advanced Encryption Algorithm

Pseudorandom Number Generation and Stream Ciphers

Public Key Cryptography and RSA

Cryptographic Hash Functions

Message Authentication Codes and Key Management

Network Security Concepts

Security in the Internet

Wireless Network Security

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