Data Integrity Algorithms Questions and Answers – Hash Functions Based on Cipher Block Chaining

This set of Cryptography Multiple Choice Questions & Answers (MCQs) focuses on “Hash Functions Based on Cipher Block Chaining”.

1. What is the effectiveness of an n-bit hash value?
a) 2ⁿ
b) 2^-n
c) 2²ⁿ
d) 2^-2n
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2. What is the effectiveness of a 128 bit hash value?
a) 2^-64
b) 2⁶⁴
c) 2^-112
d) 2^-128
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3. We define collision as: A collision occurs if we have x=y and H(x) = H(y).
a) True
b) False
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4. Consider the following properties
Variable Input size
Fixed Output size
Efficiency
Pre image resistant
Second Pre image Resistant
Collision resistant
Pseudo randomness

A has function that satisfies the first _______ properties in the above table is referred to as a weak hash function.
a) 5
b) 4
c) 3
d) 2
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5. The second pre-image resistant property is
a) It is computationally infeasible to find any pair (x, y) such that H(x) = H(y)
b) For any given block x, it is computationally infeasible to find y not equal to x, with H(y) = H(x)
c) For any given hash value h it is computationally infeasible to find y such that H(y) = h
d) None of the mentioned
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6. A function that is second pre-image resistant is also collision resistant.
a) True
b) False
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7. For an m-bit value, the adversary would have to try ____________ values to generates a given hash value h.
a) 2^m
b) 2^(m-1)
c) 2^(m/2)
d) (2^m) – 1
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8. For an m bit hash value, if we pick data blocks at random we can expect to find two data blocks with the same hash value within ____ attempts.
a) 2^m
b) 2^(m-1)
c) 2^(m/2)
d) (2^m) – 1
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9. Which attack requires the least effort/computations?
a) Pre-image
b) Second Pre-image
c) Collision
d) All required the same effort
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