The reference book can be downloaded here
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Section 2: Mastering File and Directory Access Control (DAC)
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Section 3: Advanced System Hardening Techniques
- Chapter 9: Implementing Mandatory Access Control with SELinux and AppArmor
- Chapter 10: Kernel Hardening and Process Isolation
- Chapter 11: Scanning Auditing and Hardening
- Chapter 12: Logging and Log Security
- Chapter 13: Vulnerability Scanning and Intrusion Detection
- Chapter 14: Security Tips and Tricks for the Busy Bee