Symmetric Ciphers Questions and Answers – Principles of PRNG – II

This set of Cryptography Interview Questions and Answers for experienced focuses on “Principles of PRNG”

1. Which among the following cannot be used in the case of stream ciphers?
a) TRNGs
b) PRNGs
c) PRFs
d) All of the mentioned
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2. A stream cipher key is usually of size ___ or 128 bits.
a) 56
b) 64
c) 54
d) 48
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3. Which among the following has the lowest bitrate ?
a) PRF
b) TRNG
c) PRNG
d) All have the same bitrate
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4. RC4 was built on the sole purpose of generating random bits i.e. to act as a PRNG.
a) True
b) False
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5. Maurer’s Universal Statistical Test is –
a) a test to determine whether the number of runs of ones and zeros of various lengths is as expected
b) a test to detect if a sequence can be significantly compressed without loss of information
c) a test to determine whether the number of ones and zeros in a sequence is approx the same as in a truely random o/p
d) a test for the check of evenness in the 1s and 0s
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6. Runs Test is
a) a test to determine whether the number of runs of ones and zeros of various lengths is as expected
b) a test to detect if a sequence can be significantly compressed without loss of information
c) a test to determine whether the number of ones and zeros in a sequence is approx the same as in a truely random o/p
d) a test for the check of evenness in the 1s and 0s
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7. Frequency Test is
a) a test to determine whether the number of runs of ones and zeros of various lengths is as expected
b) a test to detect if a sequence can be significantly compressed without loss of information
c) a test for the check of evenness in the 1s and 0s
d) a test to determine whether the number of ones and zeros in a sequence is approx the same as in a truely random o/p
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8. We should not be able to determine the seed from any previous knowledge of the bits sequence. This is the property of backward unpredictability.
a) True
b) False
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9. Forward Unpredictability is a property when the seed is unknown, and the next output bit is the sequence should be unpredictable.
a) True
b) False
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