#ELECTRONIC CODEBOOK CODE#

CFB mode requires an initialization vector to be used as the first random n-bit input block in order to function properly.

Each ciphertext block gets 'fed back' into the encryption processДЄs part of the Cipher Feedback (CFB) Mode encryption process, each ciphertext block is 'fed back' into the overall encryption process in order to encrypt the next plaintext block.

To put it another way, encryption is the opposite process of decryption, which consists in decrypting the current ciphertext and then adding the preceding ciphertext block to the result.Д©) With reference to Cipher Feedback (CFB) Mode, amongst which of the following is /are true, If you are using CBC mode, the current plaintext block is added to the previous ciphertext block, and the result is then encrypted with the secret key. After XORing the previous cypher block with the original plaintext block, the previous cypher block is sent on as input to the next encryption algorithm in the CBC scheme.ДЁ) In Cipher block chaining mode, the current plaintext block is added to the _.

#ELECTRONIC CODEBOOK CODE#

This is a straightforward implementation of the block cypher.Д§) Cipher block chaining or CBC is an advancement made to electronic code book,Д¬ipher block chaining, often known as CBC, is an improvement on the ECB algorithm since the ECB algorithm breaches some security standards. It is feasible to do parallel encryption of blocks of bits in this manner.

The electronic code book is the most straightforward block cypher manner of operation.

Parallel encryption of blocks of bits is possible.

CBC is a mode of operation for stream ciphersД¬BC which stands for Cipher Block chaining is a mode of operation for block ciphers and not for stream ciphers.ДҐ) Which of the following modes of operations can be followed for both stream ciphers as well as block ciphers?Д¬FB is primarily a mode to derive some characteristics of a stream cipher from a block cipher on the cryptography in cryptoanalysis.Д¦) Amongst which of the following is/ are showing the goodness of electronic code book,

It has better resistive nature towards cryptanalysis than ECBДЄnswer: a.

Initialization vector (IV) is used in CBC in the initial phase.

CBC is a mode of operation for stream ciphers.

Therefore, it is easy for an outsider to break the encryption logic and steal the data.Д¤) Which of the following options is not correct according to the definition of the Cipher Block Chaining (CBC)? In ECB, there lies a direct relation between the plain text and the ciphertext. It is prone to cryptanalysis since there is a direct relationship between plain text and cipher text.

It is prone to cryptanalysis since there is a direct relationship between plain text and cipher text.ДЄnswer: c.

Padding is done to make the plain text divisible into blocks of fixed size.

Which of the following is the major drawback of ECB?

This is due to some particular words and phrases that may be reused again often so that the same repetitive part of ciphertext can emerge as mixed.ДЈ) Which of the following is the main disadvantage of the ECB (Electronic Code Book)?

If not, the text is padded to make it of the required length. It is preferred that the block size in the EBC technique must be greater than 64 bits. All of the above.Дў) For which of the following should EBC (Electronic Code Book) process not be used for encryption? Submitted by Monika Sharma, on March 23, 2020ДЎ) Which of the following is a mode of operation for the Block ciphers in cryptography?ДЄll the mentioned modes are followed by the block cipher techniques. Here, we have a set of multiple-choice questions and answers (quiz) on Modes of Operations in Block Cipher.

Electronic codebook