Cryptography Questions and Answers – Symmetric Key Distribution – II

This set of Cryptography Aptitude Test focuses on “Symmetric Key Distribution”.

1. Larger networks would prefer a full decentralization.
a) True
b) False
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2. Which of these is not a type of session key?
a) PIN-encrypting key
b) File-encrypting key
c) Session encrypting key
d) Data encrypting key
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3. Which session key is used for electronic funds transfer and point of sale applications?
a) Data-encrypting key
b) File-encrypting key
c) PIN-encrypting key
d) None of the mentioned
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4. Sometimes a simple tag is introduced along with the session key. This tag has 8 bits. Which of the following options is wrong?
a) One bit indicates whether the key is a session key or a master key
b) One bit indicates whether the key can be used for encryption
c) Three bit indicates whether the key can be used for decryption
d) Remaining bits are for future use
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5. Hash Value = H = h(CV)
Key Input = Km XOR H
Ciphertext = E([Km XOR H],Ks)
What is CV here?
a) Cipher vector
b) Current vector
c) Control vector
d) None of the mentioned
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6. Which is the correct representation for session key recovery for the plain text?
a) D ([Km XOR H], E([Km XOR H], Ks)
b) D([Km XOR H],Ks)
c) D ([Km XOR H], E([Km XOR H])
d) None of the mentioned
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7. Which of the following is required to find the session key?
i) Control Vector
ii) Master Key
iii) Encrypted session Key

a) i)
b) i) and ii)
c) i) and iii)
d) i) ii) and iii)
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8. “Meet in the middle attack” and “man in the middle attack” are the same.
a) True
b) False
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9. “Meet in the middle attack” is an attack
a) where the timing required for the attack via brute force is drastically reduced
b) where the adversary uses 2 or more machines to decrypt thus trying to reduce the time
c) where messages are intercepted and then either relayed or substituted with another message
d) where cryptanalysis takes lesser time than the brute force decryption
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Sanfoundry Global Education & Learning Series – Cryptography and Network Security.

To practice all areas of Cryptography for aptitude tests, here is complete set of 1000+ Multiple Choice Questions and Answers.

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