Network Security - Quiz 3 BITS WILP - Mtec Software Systems - 2017

Network Security - Quiz 3

BITS WILP - Mtec Software Systems - 2017 

1. Hash function should be Collision resistance
Select one:
True
False

Ans: True

2. Security of SHA-1 is 160 bits
Select one:
True
False

Ans: True

3. Symmetric key provide non-repudiation.
Select one:
True
False

Ans: False

4. SHA-1 has 80 Rounds
Select one:
True
False

Ans: True

5. Electronic Code Book mode is susceptible to substitution attacks:
Select one:
True
False

Ans: True

6. Secret prefix MAC: m = MACk(x) = h(k||x).
Select one:
True
False

Ans: True

7. Effective key length of 3DES is 112 bits
Select one:
True
False

Ans: True

8. SHA-1 is based on Merkel-Damgard construction
Select one:
True
False

Ans: True

9. Key whitening makes the block ciphers such as DES/AES much more resistant against
brute-force attacks.
Select one:
True
False

Ans: True

10. SHA-1 is key-less hash algorithm
Select one:
True
False

Ans: True

11. Hash function should be one way function
Select one:
True
False

Ans: True

12. Collision Resistance: Given x1 and h(x1), it should be computationally infeasible to find any
x2 such that h(x1) = h(x2).
where h(x1) is hash(x1)
Select one:
True
False

Ans: False

13. Using the meet-in-the-middle attack, the key space is drastically reduced.
Select one:
True
False

Ans: True

14. SHA-1 has 5 stages
Select one:
True
False

Ans: False

15. Secret suffix MAC: m = MACk(x) = h(x||k).
Select one:
True
False

Ans: True

Network Security - Quiz 2 BITS WILP - Mtec Software Systems - 2017

Network Security - Quiz 2

BITS WILP - Mtec Software Systems - 2017

1. "RC4" is a block cipher
Select one:
True
False

Ans: False

2. In Cipher Block Chaining mode any ciphertext block depends on all previous plaintext blocks (except the first block)
Select one:
True
False

Ans: True

3. Electronic Code Book Mode can be parallelize

Select one:
True
False

Ans: True

4. In AES speed of decryption of a ciphertext is same as the speed of encryption of a plaintext when the on-the-fly generation of subkeys is used.

Select one:
True
False

Ans: False

5. In "AES", diffusion is achieved by MixColumn layer only.
Select one:
True
False

Ans: False

6. AES is a modern block cipher with block size 128 / 192 / 256 bits.

Select one:
True
False

Ans: False

7. OTP is unconditionally secure if key is used once.

Select one:
True
False

Ans: True

8. Cipher Block Chaining Mode has Probabilistic approach

Select one:
True
False

Ans: True

9. Electronic Code Book Mode has Deterministic approach

Select one:
True
False

Ans: True

10. Cipher Block Chaining Mode can be parallelize

Select one:
True
False

Ans: False

11. AES is a 128/192/256 key bits cipher.

Select one:
True
False

Ans: True

12. AES have a Feistel structure.
Select one:
True
False

Ans: False

13. In "AES", confusion is achieved in ShiftRows layer
Select one:
True
False

Ans: False

14. "AES" is a block cipher
Select one:
True
False

Ans: True

15. The Electronic Code Book  mode is susceptible to substitution attacks

Select one:
True
False

Ans: True

16. AES layers computations are based on Galois field.
Select one:
True
False

Ans: True

Network Security Mid-semester Examination Question Paper - 2017 Regular BITS PILANI WILP MTec Software Systems

Network Security Mid-semester Examination Question Paper - 2017 Regular
BITS PILANI WILP MTec Software Systems

Network Security - Quiz 1 - BITS WILP - Mtec Software Systems - 2017

Network Security - Quiz 1

BITS WILP - Mtec Software Systems - 2017

1. Cryptography provides security through obscurity.
Select one:
 True
 False

Ans: False

2. Security level of the cipher  does not increases by multiple substitution encryption.
Select one:
 True
 False

Ans: True

3. There are 8 equivalence class for the modulus 7
Select one:
 True
 False

Ans: False

4. In a symmetric cipher, different key are used by  the sender and receiver.
Select one:
 True
 False

Ans: False

5. Range of possible values used to construct keys is called key space.
Select one:
 True
 False

Ans: True

6. Security Services integrity assures that data received is a as sent by an authorized entity.
Select one:
 True
 False

Ans: True

7. There are 5 equivalence class for the modulus 5
Select one:
 True
 False

Ans: False

8. In symmetric cipher same key is used by  the sender and receiver.
Select one:
 True
 False

Ans: True

9. Security services authentication assures that the communicating entity is the one claimed.
Select one:
 True
 False

Ans: True

10. Security level of the encrypted message increases by multiple encrypting the message with a substitution cipher.
Select one:
 True
 False

Ans: False

11. Stream ciphers encrypt bits individually.
Select one:
 True
 False

Ans: True

12. Security level of the cipher  does not increases by multiple substitution encryption.
Select one:
 True
 False

Ans: True

13. Plaintext is the data before transformation.
Select one:
 True
 False
Ans : True

14. According to kerchoff's principle, a cryptosystem should be secure even if the attacker knows all details about the system, with the exception of the secret key.
Select one:
 True
 False

Ans: True

15. The ciphertext is the message after transformation.
Select one:
 True
 False

Ans: True

16. Security services non-repudiation protect against denial by one of the parties in a communication.
Select one:
 True
 False

Ans: True

17. A cryptosystem is unconditionally secure if it cannot be broken even with infinite computational resources.
Select one:
 True
 False

Ans: True

18. There are 7 equivalence class for the modulus 8
Select one:
 True
 False

Ans: False


19. According to kerchoff's principle, the attacker should not know the encryption and decryption algorithm.
Select one:
 True
 False

Ans: False

20. Stream ciphers encrypt bits individually.
Select one:
 True
 False

Ans: True

Network Security - SSZG513 Mid-semester Examination Question Paper - 2017 Regular BITS PILANI WILP MTec Software Systems

Network Security - SSZG513

Mid-semester Examination Question Paper - 2017 Regular

BITS PILANI WILP MTec Software Systems