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Welcome to the Pseudorandom Number Generation and Stream Ciphers MCQs Page

Dive deep into the fascinating world of Pseudorandom Number Generation and Stream Ciphers with our comprehensive set of Multiple-Choice Questions (MCQs). This page is dedicated to exploring the fundamental concepts and intricacies of Pseudorandom Number Generation and Stream Ciphers, a crucial aspect of Cryptography and Network Security. In this section, you will encounter a diverse range of MCQs that cover various aspects of Pseudorandom Number Generation and Stream Ciphers, 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 Pseudorandom Number Generation and Stream Ciphers. Test your knowledge, expand your horizons, and solidify your grasp on this vital area of Cryptography and Network Security.

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Pseudorandom Number Generation and Stream Ciphers MCQs | Page 7 of 9

Q61.
How many S-boxes are present in the blowfish algorithm?

a.

2

b.

4

c.

6

d.

8

Discuss
Answer: (b).4
Q62.
How many entries are present in each of the S-boxes present in the blowfish algorithm?
Discuss
Answer: (a).256
Q63.
In blowfish, the keys are stored in the form of an array ranging from K1, K2 to Ki. What is the value of i?
Discuss
Answer: (d).14
Q64.
To generate the sub-key P1 to P18 we use the hexadecimal equivalent digits of ____________
Discuss
Answer: (b).0.1415
Q65.
P17 gets XORed with
Discuss
Answer: (a).K3
Q66.
P15 gets XORed with
Discuss
Answer: (c).K1
Q67.
What is the number of iterations required in total to generate all the sub-keys in blowfish?
Discuss
Answer: (b).521
Q68.
A single blowfish s-box converts 8-bits to _________ bits.
Discuss
Answer: (a).32
Q69.
The 32bit output of s-box 1 is XORed with s-box 2.
Discuss
Answer: (a).True
Q70.
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
Page 7 of 9

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