Design Recipes for FPGAs, 2nd Edition

Chapter 10

Secure Systems

Abstract

This chapter introduces the key concepts in implementing block ciphers such as the data encryption standard (DES). A stream cipher operates on a digital data stream one or more bits at a time. A block cipher operates on complete blocks of data at any one time and produces a ciphertext block of equal size. DES, in common with other block ciphers is based around a structure called a Feistel Lattice so it is useful to describe how this works.

Keywords

Block ciphers

Secure systems

DES

10.1 Introduction to Block Ciphers

The data encryption standard (DES) is a symmetric block cipher. A stream cipher operates on a digital data stream one or more bits at a time. A block cipher operates on complete blocks of data ...