Cryptography

Download Coding Theory and Design Theory. Coding Theory by Ray Chaudhuri PDF

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By Ray Chaudhuri

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Extra resources for Coding Theory and Design Theory. Coding Theory

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Format-compliance, error-tolerance and constant bitrate are important features of the multimedia encryption algorithms. Chapter 3 AN OVERVIEW OF MODERN CRYPTOGRAPHY Cryptography has a rich and astounding history. The first known use of cryptography dates back to ancient Egypt. However, cryptography has gone a long way since then, and modem cryptography represents a much broader and much more complex field. The private sector became interested in cryptography when the computer era began. In the early 1970s, Horst Feistel introduced a n important family of ciphers, Feistel ciphers, based on the idea of a product cipher [12].

For the most part, computer networks belong to this group of communication channels. Suppose two participants, Alice and Bob2, are communicating over a channel. Alice and Bob would like to communicate confidentially, in other words, nobody else should be able to read or hear the exchanged messages by eavesdropping the channel. Unless they manage to disguise the messages that are being sent through the channel, a n eavesdropper could comprehend them. Fortunately, cryptography solves the problem of conducting confidential communications.

Modifying or simplifying conventional cryptosystems in order to improve the multimedia encryption performance is usually a bad idea. It is a s bad an idea a s if a construction worker would suddenly decide to build a wall using the cardboard boxes instead of bricks to save the cost or to speed up the construction process. Before you know it, someone would almost effortlessly break the wall, just a s someone would almost effortlessly break the "simplifiedn cryptosystem. Yet, a number of early multimedia security solutions used far oversimplified encryption algorithms in order to produce faster performances.

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