Computer Networks MCQs

1018 MCQs  (Page 43 of 102)

Attempt Computer Networks Quiz
What is the other name for key hash function, which is used in message authentication?
A. Message administration control
B. Message authentication code
C. Message administration code
D. Message authentication control
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What is Ci in the bit-by-bit XOR hash function, that is Ci = bi1 + bi2.….. + bim
A. Number of n bit blocks
B. Ith bit of the hash code
C. Ith bit in jth block
D. Xor operation
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When can we detect a collision if the hash values are same for two inputs, that is H(x) = H(y)?
A. When x < y
B. When x > y
C. When x = y
D. When x != y
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What is the formula for pre-images of a given hash value, where data block length = b bits and hash code = n bits?
A. 2b-n
B. 2b+n
C. 2b/n
D. 2n/b
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Which of the following is not a basic property for employing hash function in practical applications?
A. Variable input size
B. Fixed output size
C. Efficiency
D. Preimage resistant
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Which of the following property of the hash function makes the hash function strong?
A. Efficiency
B. Preimage resistant
C. Second preimage resistant
D. Collision resistant
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Brute force attack does not concentrate on bit length of the hash value.
A. True
B. False
C.
D.
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What can it be called, if an attacker determines the private key of the user, after breaking the signature scheme?
A. Universal forgery
B. Total break
C. Selective forgery
D. Existential forgery
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Which of the following is not a requirement of digital signatures?
A. Easy to produce
B. Easy to recognize
C. Easy to verify
D. Computationally feasible
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Who will be the involving parties in the direct digital signature scheme?
A. Source and destination
B. Source and third party
C. Destination and third party
D. Source and destination and third party
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Word of the Day
15 Jul
Iterate
perform or utter repeatedly.
دہرانا، چکر

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