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Here, we have a set of multiple-choice questions and answers (quiz) on Modes of Operations in Block Cipher.

questions

Title
Which of the following is a mode of operation for the Block ciphers in cryptography?

Which of the following is a mode of operation for the Block ciphers in cryptography?

  1. Electronic Code Book (ECB)
  2. Cipher Block Chaining (CBC)
  3. Counter (CTR) mode
  4. All of the above
discuss
For which of the following should EBC (Electronic Code Book) process not be used for encryption?

For which of the following should EBC (Electronic Code Book) process not be used for encryption?

  1. For large block sizes
  2. For fixed block sizes
  3. For small block sizes
  4. None of the above
discuss
Which of the following is the main disadvantage of the ECB (Electronic Code Book)? or Which of the following is the major drawback of ECB?

Which of the following is the main disadvantage of the ECB (Electronic Code Book)?

or

Which of the following is the major drawback of ECB?

  1. It requires large block size
  2. Padding is done to make the plain text divisible into blocks of fixed size
  3. It is prone to cryptanalysis since there is a direct relationship between plain text and cipher text
  4. None of the above
discuss
Which of the following options is not correct according to the definition of the Cipher Block Chaining (CBC)?

Which of the following options is not correct according to the definition of the Cipher Block Chaining (CBC)?

  1. CBC is a mode of operation for stream ciphers
  2. Initialization vector (IV) is used in CBC in the initial phase
  3. It has better resistive nature towards cryptanalysis than ECB
  4. None of the above
discuss
Which of the following modes of operations can be followed for both stream ciphers as well as block ciphers?

Which of the following modes of operations can be followed for both stream ciphers as well as block ciphers?

  1. CBC (Cipher Block Chaining)
  2. ECB (Electronic Code Book)
  3. CFB (Cipher text Feed Back)
  4. All of the above
discuss
Amongst which of the following is/ are showing the goodness of electronic code book,

Amongst which of the following is/ are showing the goodness of electronic code book,

  1. Parallel encryption of blocks of bits is possible
  2. It is a faster way of encryption
  3. Simple way of the block cipher
  4. All of the mentioned above
discuss
Cipher block chaining or CBC is an advancement made to electronic code book,

Cipher block chaining or CBC is an advancement made to electronic code book,

  1. True
  2. False
discuss
In Cipher block chaining mode, the current plaintext block is added to the ____

In Cipher block chaining mode, the current plaintext block is added to the ____.

  1. Previous ciphertext block
  2. Next ciphertext block
  3. Middle ciphertext block
  4. None of the mentioned above
discuss
With reference to Cipher Feedback (CFB) Mode, amongst which of the following is /are true,

With reference to Cipher Feedback (CFB) Mode, amongst which of the following is /are true,

  1. Each ciphertext block gets 'fed back' into the encryption process
  2. Encrypt the next plaintext block
  3. Both A and B
  4. None of the mentioned above
discuss
An initialization vector (IV) or starting variable (SV) is a block of bits that is used by several modes to _____

An initialization vector (IV) or starting variable (SV) is a block of bits that is used by several modes to _____.

  1. Randomize the decryption
  2. Randomize the encryption
  3. Minimize and maximize the randomization
  4. None of the mentioned above
discuss
total MCQs: 10

MCQs

10

Views

43

Best Answers

299

Points

5