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6.2. Objectives. ? To review a short history of DES? To define the basic structure of DES? To describe the details of building elements of DES? To describe the round keys generation process? To analyze DES. . . Chapter 6. . . . . . 6.3. . 6-1 INTRODUCTION. . The Data Encryption Standard (DES) is a symmetric-key block cipher published by the National Institute of Standards and Technology (NIST)..

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