Operating System Questions & Answers – Security – Cryptography

This set of Operating System Multiple Choice Questions & Answers (MCQs) focuses on “Security – Cryptography”.

1. What is the preferred way of encryption?
a) pre shared secret key
b) using key distribution center (KDC)
c) public key-encryption
d) symmetric key
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2. What is not a role of encryption?
a) It is used to protect data from unauthorized access during transmission
b) It is used to ensure user authentication
c) It is used to ensure data integrity
d) It is used to ensure data corruption doesn’t happens
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3. What is cipher-block chaining?
a) Data is logically ‘ANDed’ with previous block
b) Data is logically ‘ORed’ with previous block
c) Data is logically ‘XORed’ with previous block
d) None of the mentioned
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4. What is not an encryption standard?
a) AES
b) TES
c) Triple DES
d) DES
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5. Which of the following is not a stream cipher?
a) Two fish
b) RC5
c) RC4
d) TBONE
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6. What is a Hash Function?
a) It creates a small flexible block of data
b) It creates a small,fixed block of data
c) It creates a encrypted block of data
d) None of the mentioned
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7. MD5 produces __________ bits hash data.
a) 128
b) 150
c) 160
d) 112
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8. SHA-1 produces __________ bit of hash.
a) 128
b) 160
c) 150
d) 112
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9. Which two of the following are authentication algorithms?
a) MAC
b) AES
c) DAS
d) Digital-signature
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10. What is the role of Key Distribution Center?
a) It is used to distribute keys to everyone in world
b) It intended to reduce the risks inherent in exchanging keys
c) All of the mentioned
d) None of the mentioned
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Sanfoundry Global Education & Learning Series – Operating System.