Step 1IntroCipher block chaining mode in DES (Date Encryption Standard):It is a type of cipher mode where all the cipher blocks are chained to avoid the replacement of blocks.In this model, all the blocks are chained before encryption; the plaintext in a block is XOR (Exclusive OR) with a cipher text of the previous bloc.Here, the key advantage is that the output present in the cipher text block is not the same as the plaintext block. arrow_forwardStep 2Solution:Cipher feedback mode in DES (Data Encryption Standard):This type of mode is used to encrypt the data by byte-to-byte.It is similar to the cipher block chaining mode, if the encryption process in cipher block chaining is reversed, it is the decryption process of Cipher feedback mode.During the encryption process, one byte is encrypted first and sent out. Then the encryption process is carried out with the next byte.Conclusion:The output stream generated by the encryption process in cipher feedback mode is 1 byte.The output stream generated by the encryption process in cipher block chaining mode is 8 bytes.Comparing the efficiency:Therefore, the encryption in cipher block chaining mode is 8 times more efficient than the cipher feedback mode.

Cipher block chaining mode in DES (Date Encryption Standard): It is a type of cipher mode where all…

Answered: Cipher block chaining mode in DES (Date…

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Step 1

Intro

Cipher block chaining mode in DES (Date Encryption Standard):

It is a type of cipher mode where all the cipher blocks are chained to avoid the replacement of blocks.
In this model, all the blocks are chained before encryption; the plaintext in a block is XOR (Exclusive OR) with a cipher text of the previous bloc.
Here, the key advantage is that the output present in the cipher text block is not the same as the plaintext block.

arrow_forward

Step 2

Solution:

Cipher feedback mode in DES (Data Encryption Standard):

This type of mode is used to encrypt the data by byte-to-byte.
It is similar to the cipher block chaining mode, if the encryption process in cipher block chaining is reversed, it is the decryption process of Cipher feedback mode.
During the encryption process, one byte is encrypted first and sent out. Then the encryption process is carried out with the next byte.

Conclusion:

The output stream generated by the encryption process in cipher feedback mode is 1 byte.
The output stream generated by the encryption process in cipher block chaining mode is 8 bytes.

Comparing the efficiency:

Therefore, the encryption in cipher block chaining mode is 8 times more efficient than the cipher feedback mode.

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