Jun 21st, 2015
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Data encryption is used pervasively in today’s connected society. The two most basic facets of modern day data encryption are data privacy and authentication.

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CHAPTER 1 INTRODUCTION TO DATA ENCRYPTIONData encryption is used pervasively in todays connected society. The two most basic facets of modern day data encryption are data privacy and authentication. As modern society becomes more connected, and more information becomes available there is a need for safeguards which bring data integrity and data secrecy. In addition, authenticating the source of information gives the recipient, with complete certainty that the information came from the original source and that it has not been altered from its original state. Both, the needs for information privacy and data authentication have motivated cryptography. Todays connected society requires secure data encryption devices to preserve data privacy and authentication in critical applications. Of the several data encryption types, Data Encryption Standard (DES) and its variant have emerged to be the most popular and is commonly used in varying applications.1.1 Need for SecuritySteps involved in secured communication: 1. Design an algorithm for performing the security related transformation such that the opponent cannot defeat its purpose.2. Generate the secret information to be used with the algorithm. 3. Specify the protocol to be used by the two principles that make use of the security algorithm.Due to advance of globalization, now days most of the financial transactions and personal information is transferred on the internet. Because of this process data encryptio

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