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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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Pseudorandom Number Generation and Stream Ciphers MCQs | Page 4 of 9

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Q31.
while (len(temp) < requested_number_of_bits) do

V = E(Key, V)
temp = temp || V

The above algorithm is for the CTR mode.
Discuss
Answer: (c).False. It is for the OFB mode
Q32.
Which mode is less prone to decryption : PRNG using CTR / PRNG using OFB?
Discuss
Answer: (b).CTR
Q33.
ANSI X9.17 uses a seed of size
Discuss
Answer: (b).64 bits
Q34.
How many 3DES blocks are present in the ANSI X9.17 PRNG?

a.

2

b.

3

c.

4

d.

5

Discuss
Answer: (b).3
Q35.
How many DES encryptions take place in the ANSI X9.17 PRNG?

a.

3

b.

6

c.

9

d.

12

Discuss
Answer: (d).12
Q36.
Which of the following PRNGs is used in most recent Intel Chips?
Discuss
Answer: (b).NIST CTR_DRBG
Discuss
Answer: (d).Output Block Length + Key Length
Q38.
The CTR mode uses a Key K and an Initial Vector V. The Intel Digital Random Number generator has these values initially as
Discuss
Answer: (b).K = 0 ; V = 0
Q39.
What is the Seed length (seedlen) length for AES-192 ?
Discuss
Answer: (c).320
Q40.
What is the Seed length (seedlen) length for 3DES?
Discuss
Answer: (c).232
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