Data Integrity Algorithms Questions and Answers – Message Authentication Codes (MACs)

This set of Cryptography Multiple Choice Questions & Answers (MCQs) focuses on “Message Authentication Codes (MACs)”.

1. Which figure implements confidentiality and authentication?
a)

b)

c)

d)

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2. Which figure implements confidentiality, authentication and signature?
a)

b)

c)

d)

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3. The above figure implements authentication and signature only?

a) True
b) False
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4. The above figure represents internal error control.

a) True
b) False
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5. Another name for Message authentication codes is
a) cryptographic codebreak
b) cryptographic codesum
c) cryptographic checksum
d) cryptographic checkbreak
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6. The following figure has authentication tied to the plaintext-

a) True
b) False
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7. For a 150-bit message and a 10-bit MAC, how many values are the MAC value dependent on?
a) 2¹⁴⁰
b) 2¹⁵⁰
c) 2¹⁵
d) 2¹⁰
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8. Confidentiality can only be provided if we perform message encryption before the MAC generation.
a) True
b) False
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9. MACs are also called
a) testword
b) checkword
c) testbits
d) none of the mentioned
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10. For a 100 bit key and a 32 bit tag, how many possible keys can be produced in the 3rd round?
a) 2⁴
b) 2³²
c) 2¹⁶
d) 2⁶⁴
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11. MAC is a
a) one-to-one mapping
b) many-to-one mapping
c) onto mapping
d) none of the mentioned
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12. For an n-bit tag and a k-bit key, the level of effort required for brute force attack on a MAC algorithm is
a) 2^k
b) 2ⁿ
c) min(2^k,2ⁿ)
d) 2^k/2ⁿ
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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.

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