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Section 8: (12 points) Summary of first half class of textbook "Introduction to Computer Security". We have covered An Overview of Computer Security (slides); Cryptography, private key (slides); public key (slides); An Overview of Computer Security (Chl); Access Control Matrix (Ch2); Foundational Results (Ch3), Security Policies (Ch4), Confidentiality Policies (Ch5), Integrity Policies (Cho), Hybrid Policies (Ch7); Basic Cryptography (Ch8); Key Management (Ch9); Cipher Techniques (Ch10); Authentication (Ch11). Please write down your understanding (or summary) of the chapters