CHAPTER 8

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Cryptography

Introduction

It is easy for someone to read data if it is in plain text, and confidential and sensitive messages in plain text can be easily compromised. Information meant for a specific set of eyes must be carefully guarded. Spies use secret codes to communicate with their secret agents. Julius Caesar never trusted his messengers carrying message to his generals. He encrypted his messages by replacing every A with a D, every B with E, and so on, so only the intended recipient could decipher the message.

Information security is the protection of organizational/personal data from unauthorized users. The basic components of ...

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