Discussion (400 words - APA format)

After reading chapter 4, evaluate the history of the Data Encryption Standard (DES) and then how it has transformed cryptography with the advancement of triple DES. You must use at least one scholarly resource.  Discussion posting must be properly APA formatted. 

Read the PPT and also research other sources in online to answer. need high quality work. 

 Overview
Week 3 OverviewThe objective of this chapter is to illustrate the principles of modern symmetric ciphers. For this purpose, we focus on the most widely used symmetric cipher: the Data Encryption Standard (DES). Although numerous symmetric ciphers have been developed since the introduction of DES, and although it is destined to be replaced by the Advanced Encryption Standard (AES), DES remains the most important such algorithm. Furthermore, a detailed study of DES provides an understanding of the principles used in other symmetric ciphers.

Objectives
 you should be able to:

1. Understand the difference between stream ciphers and block ciphers.
2. Present an overview of Data Encryption Standard (DES).
3. Discuss the cryptographic strength of DES.