Cryptography and Network Security Principles and Practice, 8th Edition - Pearson

CHAPTER 4

Block Ciphers and the Data Encryption Standard

 

4.1 Traditional Block Cipher Structure

Stream Ciphers and Block Ciphers

Motivation for the Feistel Cipher Structure

The Feistel Cipher

 

4.2 The Data Encryption Standard

DES Encryption

DES Decryption

 

4.3 A DES Example

Results

The Avalanche Effect

 

4.4 The Strength of DES

The Use of 56-Bit Keys

The Nature of the DES Algorithm

Timing Attacks

 

4.5 Block Cipher Design Principles

Number of Rounds

Design of Function F

Key Schedule Algorithm

 

4.6 Key Terms, Review Questions, and Problems

 

LEARNING OBJECTIVES

After studying this chapter, you should be able to

• ◆ Understand the distinction between stream ciphers and block ciphers.
• ◆ Present an overview of the Feistel cipher and explain ...