Symmetric Ciphers Questions and Answers – Pseudorandom Number Generators and Stream Ciphers – I

This set of Cryptography Multiple Choice Questions & Answers (MCQs) focuses on “Pseudorandom Number Generators and Stream Ciphers”.

1. Using the Linear Congruential Method (LCM), for a=7, c=0 and m=32. The period is
a) 13
b) 4
c) 11
d) 7
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2. Using the Linear Congruential Method, for a=5, c=0 and m=32. The period is
a) 8
b) 4
c) 9
d) 11
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3. The appropriate value for m (in LCM) is
a) 2⁽³¹⁾ – 1
b) 2⁽³¹⁾
c) 2⁽³²⁾
d) 2⁽³²⁾ – 1
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4. A CSPRBG is defined as one that passes the __ test.
a) Runs test
b) Maurer’s Universal statistical test
c) Frequency Test
d) On-bit test
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5. Find the first 8 bits for Blum Blum Shub Bit Generator when seed = 101355 and n = 192649.
a) 10101010
b) 11100010
c) 11001011
d) 11001110
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6. Which of these modes is an appropriate mode for PRNG?
a) ECB
b) CBC
c) CFB
d) CTR
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7. Which mode is recommend for the X9.82 Random number generator?
a) OFB
b) CBC
c) CFB
d) CTR
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8. AES PRNG produces bits outputs of size
a) 512 bits
b) 128 bits
c) 256 bits
d) 64 bits
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9. Which mode is recommend for the ANSI standard X9.82 Random number generator?
a) OFB
b) CTR
c) CFB
d) CFB
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10. The CTR algorithm for PRNG is known as
a) CTR_PRNG
b) X-SESS
c) CTR-SESS
d) CTR_DRBG
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11. Which mode is recommend for the RFC 4086 Random number generator?
a) CFB
b) CBC
c) OFB
d) CTR
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12. while (len(temp) < requested_number_of_bits) do
V = E(Key, V)
temp = temp || V

The above algorithm is for the CTR mode.
a) True
b) False. It is for the ECB mode
c) False. It is for the OFB mode
d) False. It is for the CFB mode
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Sanfoundry Global Education & Learning Series – Cryptography and Network Security.

To practice all areas of Cryptography and Network Security, here is complete set of 1000+ Multiple Choice Questions and Answers.