Welcome to the Encryption Techniques MCQs Page

Dive deep into the fascinating world of Encryption Techniques with our comprehensive set of Multiple-Choice Questions (MCQs). This page is dedicated to exploring the fundamental concepts and intricacies of Encryption Techniques, a crucial aspect of Cryptography and Network Security. In this section, you will encounter a diverse range of MCQs that cover various aspects of Encryption Techniques, 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 Encryption Techniques. 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 Encryption Techniques. You can click on an option to test your knowledge before viewing the solution for a MCQ. Happy learning!

Encryption Techniques MCQs | Page 2 of 7

Explore more Topics under Cryptography and Network Security

01

Cryptography Basics

02

Data Encryption Standard

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.

Use Caesar’s Cipher to decipher the following:

HQFUBSWHG WHAW

ABANDONED LOCK

ENCRYPTED TEXT

ABANDONED TEXT

ENCRYPTED LOCK

Discuss

Answer: (b).ENCRYPTED TEXT

Q12.

Caesar Cipher is an example of

Poly-alphabetic Cipher

Mono-alphabetic Cipher

Multi-alphabetic Cipher

Bi-alphabetic Cipher

Discuss

Answer: (b).Mono-alphabetic Cipher

Q13.

Monoalphabetic ciphers are stronger than Polyalphabetic ciphers because frequency analysis is tougher on the former.

True

False

May be

Can't say

Discuss

Answer: (b).False

Q14.

Which are the most frequently found letters in the English language ?

e,a

e,o

e,t

e,i

Discuss

Answer: (c).e,t

Q15.

Choose from among the following cipher systems, from best to the worst, with respect to ease of decryption using frequency analysis.

Random Polyalphabetic, Plaintext, Playfair

Random Polyalphabetic, Playfair, Vignere

Random Polyalphabetic, Vignere, Playfair, Plaintext

Random Polyalphabetic, Plaintext, Beaufort, Playfair

Discuss

Answer: (c).Random Polyalphabetic, Vignere, Playfair, Plaintext

Q16.

On Encrypting “thepepsiisintherefrigerator” using Vignere Cipher System using the keyword “HUMOR” we get cipher text-

abqdnwewuwjphfvrrtrfznsdokvl

abqdvmwuwjphfvvyyrfznydokvl

tbqyrvmwuwjphfvvyyrfznydokvl

baiuvmwuwjphfoeiyrfznydokvl

Discuss

Answer: (b).abqdvmwuwjphfvvyyrfznydokvl

Q17.

On Encrypting “cryptography” using Vignere Cipher System using the keyword “LUCKY” we get cipher text

nlazeiibljji

nlazeiibljii

olaaeiibljki

mlaaeiibljki

Discuss

Answer: (a).nlazeiibljji

Q18.

The Index of Coincidence for English language is approximately

0.068

0.038

0.065

0.048

Discuss

Answer: (c).0.065

Q19.

If all letters have the same chance of being chosen, the IC is approximately

0.065

0.035

0.048

0.038

Discuss

Answer: (d).0.038

Q20.

Consider the cipher text message with relative frequencies:

4 0 10 25 5 32 24 15 6 11 5 5 1 2 6 6 15 19 10 0 6 28 8 2 3 2
The Index of Coincidence is

0.065

0.048

0.067

0.042

Discuss

Answer: (c).0.067

Page 2 of 7

Welcome to the Encryption Techniques MCQs Page

Encryption Techniques MCQs | Page 2 of 7

Explore more Topics under Cryptography and Network Security

Cryptography Basics

Data Encryption Standard

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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