Intrusion Detection Systems

  1. IDS Classification by Detection Methodology
    1. Signature-Based Detection
      1. Core Principles
        1. Pattern Matching
          1. Rule-Based Logic
            1. Hash-Based Detection
              1. String Matching Algorithms
              2. Signature Development and Management
                1. Signature Creation Process
                  1. Signature Database Maintenance
                    1. Update Distribution
                      1. Custom Signature Development
                      2. Common Signature Formats
                        1. Snort Rules
                          1. Suricata Rules
                            1. YARA Rules
                              1. Regular Expressions
                              2. Strengths and Advantages
                                1. High Accuracy for Known Threats
                                  1. Low False Positive Rate
                                    1. Fast Processing Speed
                                      1. Clear Alert Context
                                      2. Limitations and Weaknesses
                                        1. Zero-Day Attack Blindness
                                          1. Evasion Susceptibility
                                            1. Maintenance Overhead
                                              1. Signature Explosion Problem
                                            2. Anomaly-Based Detection
                                              1. Core Principles
                                                1. Baseline Establishment
                                                  1. Deviation Detection
                                                    1. Statistical Analysis
                                                      1. Behavioral Modeling
                                                      2. Baseline Creation Methods
                                                        1. Statistical Baselines
                                                          1. Machine Learning Baselines
                                                            1. Protocol-Based Baselines
                                                              1. Time-Series Baselines
                                                              2. Detection Techniques
                                                                1. Statistical Methods
                                                                  1. Machine Learning Algorithms
                                                                    1. Neural Networks
                                                                      1. Clustering Analysis
                                                                      2. Strengths and Advantages
                                                                        1. Novel Attack Detection
                                                                          1. Insider Threat Detection
                                                                            1. Adaptive Capabilities
                                                                              1. Zero-Day Protection
                                                                              2. Limitations and Weaknesses
                                                                                1. High False Positive Rate
                                                                                  1. Baseline Definition Challenges
                                                                                    1. Gradual Attack Susceptibility
                                                                                      1. Training Period Requirements
                                                                                    2. Stateful Protocol Analysis
                                                                                      1. Protocol State Tracking
                                                                                        1. Connection Context Maintenance
                                                                                          1. Protocol Conformance Validation
                                                                                            1. Deep Packet Inspection
                                                                                            2. Hybrid Detection Approaches
                                                                                              1. Multi-Method Integration
                                                                                                1. Complementary Strengths
                                                                                                  1. Implementation Strategies
                                                                                                    1. Performance Optimization

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                                                                                                  3. IDS Classification by Deployment Location

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                                                                                                  5. IDS Architecture and System Components