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Lecture Security + Guide to Network Security Fundamentals - Chapter 9 include objectives: Explain cryptography strengths and vulnerabilities, define public key infrastructure (PKI), manage digital certificates, explore key management. | Chapter 9 Using and Managing Keys Security Guide to Network Security Fundamentals Second Edition Objectives Explain cryptography strengths and vulnerabilities Define public key infrastructure PKI Manage digital certificates Explore key management Understanding Cryptography Strengths and Vulnerabilities Cryptography is science of scrambling data so it cannot be viewed by unauthorized users making it secure while being transmitted or stored When the recipient receives encrypted text or another user wants to access stored information it must be decrypted with the cipher and key to produce the original .