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Welcome to the Cryptography Basics MCQs Page

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

Cryptography Basics MCQs | Page 2 of 11

Q11.
The blowfish algorithm’s key expansion converts a key of at most 448 bits into several subkey arrays totaling ___ bytes.
Discuss
Answer: (c).4168
Q12.
Which of the following statements are true with respect to the blowfish algorithm?

i) Provided key is large enough, brute-force key search is not practical, especially given the high key schedule cost
ii) Key dependent S-boxes and sub keys make analysis very difficult
iii) Changing both halves in each round increases security
iv) Blowfish has improved avalanche effects
Discuss
Answer: (d).All are true
Discuss
Answer: (b).encrypted/ decrypted using ciphertext-stealing
Q14.
How many keys are used in the ANSI X9.17 PRNG?

a.

3

b.

2

c.

4

d.

6

Discuss
Answer: (a).3
Discuss
Answer: (b).a test to detect if a sequence can be significantly compressed without loss of information
Q16.
On Encrypting “thepepsiisintherefrigerator” using Vignere Cipher System using the keyword “HUMOR” we get cipher text
Discuss
Answer: (b).abqdvmwuwjphfvvyyrfznydokvl
Q17.
Consider the cipher text message:

YJIHX RVHKK KSKHK IQQEV IFLRK QUZVA EVFYZ RVFBX UKGBP KYVVB QTAJK TGBQO ISGHU CWIKX QUXIH DUGIU LMWKG CHXJV WEKIH HEHGR EXXSF DMIIL UPSLW UPSLW AJKTR WTOWP IVXBW NPTGW EKBYU SBQWS

Relative Frequencies
3 7 2 2 5 5 7 9 11 4 14 4 2 1 3 4 6 5 6 5 7 10 9 8 4 2

The Index of Coincidence is
Discuss
Answer: (d).0.044
Q18.
The plain text for the cipher text RRLMWBKASPDH. Given the encryption key
[(17 17 5 | 21 18 21 | 2 2 19)] is –
Discuss
Answer: (a).PAYMOREMONEY
Q19.
The Inverse S-box value for byte stored in cell (D,2)
Discuss
Answer: (c).0x7F
Q20.
Division of (131B6C3) base 16 by (lA2F) base 16 yeilds
Discuss
Answer: (d).9AD
Page 2 of 11

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