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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.

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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

Q11.
Use Caesar’s Cipher to decipher the following:

HQFUBSWHG WHAW

a.

ABANDONED LOCK

b.

ENCRYPTED TEXT

c.

ABANDONED TEXT

d.

ENCRYPTED LOCK

Discuss
Answer: (b).ENCRYPTED TEXT
Q12.
Caesar Cipher is an example of

a.

Poly-alphabetic Cipher

b.

Mono-alphabetic Cipher

c.

Multi-alphabetic Cipher

d.

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.

a.

True

b.

False

c.

May be

d.

Can't say

Discuss
Answer: (b).False
Q14.
Which are the most frequently found letters in the English language ?

a.

e,a

b.

e,o

c.

e,t

d.

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.

a.

Random Polyalphabetic, Plaintext, Playfair

b.

Random Polyalphabetic, Playfair, Vignere

c.

Random Polyalphabetic, Vignere, Playfair, Plaintext

d.

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-

a.

abqdnwewuwjphfvrrtrfznsdokvl

b.

abqdvmwuwjphfvvyyrfznydokvl

c.

tbqyrvmwuwjphfvvyyrfznydokvl

d.

baiuvmwuwjphfoeiyrfznydokvl

Discuss
Answer: (b).abqdvmwuwjphfvvyyrfznydokvl
Q17.
On Encrypting “cryptography” using Vignere Cipher System using the keyword “LUCKY” we get cipher text

a.

nlazeiibljji

b.

nlazeiibljii

c.

olaaeiibljki

d.

mlaaeiibljki

Discuss
Answer: (a).nlazeiibljji
Q18.
The Index of Coincidence for English language is approximately

a.

0.068

b.

0.038

c.

0.065

d.

0.048

Discuss
Answer: (c).0.065
Q19.
If all letters have the same chance of being chosen, the IC is approximately

a.

0.065

b.

0.035

c.

0.048

d.

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

a.

0.065

b.

0.048

c.

0.067

d.

0.042

Discuss
Answer: (c).0.067
Page 2 of 7

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