Security – Cryptography MCQ’s

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

1. 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

2. 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

3. 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

4. What is not an encryption standard?
a) AES
b) TES
c) Triple DES
d) DES

5. 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

6. Which of the following is not a stream cipher?
a) Two fish
b) RC5
c) RC4
d) TBONE

7. SHA-1 produces __________ bit of hash.
a) 128
b) 160
c) 150
d) 112

8. MD5 produces __________ bits hash data.
a) 128
b) 150
c) 160
d) 112

9. Which two of the following are authentication algorithms?
a) MAC
b) AES
c) DAS
d) Digital-signature

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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