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Other Public Key Cryptosystems and Cryptographic Hash Functions - Hash Functions Based on Cipher Block Chaining - Quiz No.1

gs gs124 Other Public Key Cryptosystems and Cryptographic Hash Functions - Hash Functions Based on Cipher Block Chaining - Quiz No.1

gs gs124 Introduction Cyber Security Quiz

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Question 1: What is the effectiveness of an n-bit hash value?
2n
2-n
22n
2-2n
Question 2: What is the effectiveness of a 128 bit hash value?
2-64
264
2-112
2-128
Question 3: We define collision as: A collision occurs if we have x=y and H(x) = H(y).
True
False
Question 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.

5
4
3
2
Question 5: The second pre-image resistant property is
It is computationally infeasible to find any pair (x, y) such that H(x) = H(y)
For any given block x, it is computationally infeasible to find y not equal to x, with H(y) = H(x)
For any given hash value h it is computationally infeasible to find y such that H(y) = h
None of the mentioned
Question 6: A function that is second pre-image resistant is also collision resistant.
True
False
Question 7: For an m-bit value, the adversary would have to try ____________ values to generates a given hash value h.
2m
2(m-1)
2(m/2)
(2m) – 1
Question 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.
2m
2(m-1)
2(m/2)
(2m) – 1
Question 9: Which attack requires the least effort/computations?
Pre-image
Second Pre-image
Collision
All required the same effort

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