Network Security and Intrusion Detection

  1. Detection Methodologies
    1. Signature-based Detection
      1. Signature Fundamentals
        1. Pattern Matching Concepts
          1. Rule-based Detection Logic
            1. Signature Components
            2. Signature Types
              1. Atomic Signatures
                1. Single-packet Analysis
                  1. Static Pattern Matching
                    1. Header-based Signatures
                    2. Stateful Signatures
                      1. Multi-packet Analysis
                        1. Connection State Tracking
                          1. Sequence-based Detection
                          2. Behavioral Signatures
                            1. Activity Pattern Matching
                              1. Threshold-based Rules
                                1. Time-based Patterns
                              2. Signature Development
                                1. Signature Creation Process
                                  1. Testing and Validation
                                    1. Performance Optimization
                                      1. False Positive Reduction
                                      2. Signature Management
                                        1. Signature Databases
                                          1. Update Mechanisms
                                            1. Version Control
                                              1. Custom Signature Development
                                              2. Signature-based Detection Strengths
                                                1. High Accuracy for Known Threats
                                                  1. Low False Positive Rates
                                                    1. Deterministic Results
                                                      1. Efficient Processing
                                                      2. Signature-based Detection Limitations
                                                        1. Zero-day Attack Blindness
                                                          1. Evasion Susceptibility
                                                            1. Maintenance Overhead
                                                              1. Signature Explosion
                                                            2. Anomaly-based Detection
                                                              1. Anomaly Detection Principles
                                                                1. Normal Behavior Modeling
                                                                  1. Deviation Measurement
                                                                    1. Threshold Definition
                                                                      1. Adaptive Learning
                                                                      2. Baseline Establishment
                                                                        1. Training Period Requirements
                                                                          1. Data Collection Methods
                                                                            1. Profile Creation
                                                                              1. Baseline Maintenance
                                                                              2. Statistical Anomaly Detection
                                                                                1. Statistical Models
                                                                                  1. Mean and Standard Deviation
                                                                                    1. Probability Distributions
                                                                                      1. Time Series Analysis
                                                                                      2. Threshold-based Detection
                                                                                        1. Static Thresholds
                                                                                          1. Dynamic Thresholds
                                                                                            1. Adaptive Thresholds
                                                                                            2. Multivariate Analysis
                                                                                              1. Correlation Analysis
                                                                                                1. Principal Component Analysis
                                                                                                  1. Cluster Analysis
                                                                                                2. Protocol Anomaly Detection
                                                                                                  1. Protocol Compliance Checking
                                                                                                    1. RFC Compliance
                                                                                                      1. Protocol State Validation
                                                                                                        1. Field Value Validation
                                                                                                        2. Protocol Behavior Analysis
                                                                                                          1. Request-Response Patterns
                                                                                                            1. Session Characteristics
                                                                                                              1. Timing Analysis
                                                                                                            2. Traffic Anomaly Detection
                                                                                                              1. Volume-based Anomalies
                                                                                                                1. Traffic Volume Spikes
                                                                                                                  1. Bandwidth Utilization
                                                                                                                    1. Connection Rate Changes
                                                                                                                    2. Pattern-based Anomalies
                                                                                                                      1. Communication Patterns
                                                                                                                        1. Temporal Patterns
                                                                                                                          1. Geographical Patterns
                                                                                                                          2. Content-based Anomalies
                                                                                                                            1. Payload Analysis
                                                                                                                              1. Application Behavior
                                                                                                                                1. Data Transfer Patterns
                                                                                                                              2. Machine Learning Approaches
                                                                                                                                1. Supervised Learning
                                                                                                                                  1. Classification Algorithms
                                                                                                                                    1. Training Data Requirements
                                                                                                                                      1. Feature Selection
                                                                                                                                      2. Unsupervised Learning
                                                                                                                                        1. Clustering Algorithms
                                                                                                                                          1. Outlier Detection
                                                                                                                                            1. Dimensionality Reduction
                                                                                                                                            2. Deep Learning
                                                                                                                                              1. Neural Networks
                                                                                                                                                1. Autoencoders
                                                                                                                                                  1. Recurrent Neural Networks
                                                                                                                                                2. Anomaly Detection Strengths
                                                                                                                                                  1. Zero-day Attack Detection
                                                                                                                                                    1. Unknown Threat Identification
                                                                                                                                                      1. Adaptive Capabilities
                                                                                                                                                        1. Comprehensive Coverage
                                                                                                                                                        2. Anomaly Detection Limitations
                                                                                                                                                          1. High False Positive Rates
                                                                                                                                                            1. Training Requirements
                                                                                                                                                              1. Computational Complexity
                                                                                                                                                                1. Baseline Drift Issues
                                                                                                                                                              2. Stateful Protocol Analysis
                                                                                                                                                                1. Protocol State Machines
                                                                                                                                                                  1. State Definition
                                                                                                                                                                    1. Transition Rules
                                                                                                                                                                      1. State Validation
                                                                                                                                                                      2. Connection State Tracking
                                                                                                                                                                        1. TCP State Tracking
                                                                                                                                                                          1. Three-way Handshake
                                                                                                                                                                            1. Data Transfer Phase
                                                                                                                                                                              1. Connection Termination
                                                                                                                                                                              2. UDP Pseudo-state Tracking
                                                                                                                                                                                1. Request-Response Pairs
                                                                                                                                                                                  1. Timeout Handling
                                                                                                                                                                                  2. Application Protocol States
                                                                                                                                                                                    1. HTTP Session States
                                                                                                                                                                                      1. FTP Command Sequences
                                                                                                                                                                                        1. SMTP Transaction States
                                                                                                                                                                                      2. Protocol Deviation Detection
                                                                                                                                                                                        1. Invalid State Transitions
                                                                                                                                                                                          1. Protocol Violations
                                                                                                                                                                                            1. Timing Anomalies
                                                                                                                                                                                              1. Sequence Number Analysis
                                                                                                                                                                                              2. Stateful Analysis Benefits
                                                                                                                                                                                                1. Context-aware Detection
                                                                                                                                                                                                  1. Reduced False Positives
                                                                                                                                                                                                    1. Attack Sequence Recognition
                                                                                                                                                                                                      1. Protocol Compliance Validation
                                                                                                                                                                                                    2. Hybrid Detection Approaches
                                                                                                                                                                                                      1. Multi-method Integration
                                                                                                                                                                                                        1. Signature and Anomaly Combination
                                                                                                                                                                                                          1. Weighted Scoring Systems
                                                                                                                                                                                                            1. Consensus-based Detection
                                                                                                                                                                                                            2. Adaptive Detection Systems
                                                                                                                                                                                                              1. Learning-based Adaptation
                                                                                                                                                                                                                1. Feedback Mechanisms
                                                                                                                                                                                                                  1. Dynamic Rule Generation
                                                                                                                                                                                                                  2. Correlation-based Detection
                                                                                                                                                                                                                    1. Event Correlation
                                                                                                                                                                                                                      1. Multi-source Analysis
                                                                                                                                                                                                                        1. Temporal Correlation
                                                                                                                                                                                                                        2. Risk-based Detection
                                                                                                                                                                                                                          1. Risk Scoring Models
                                                                                                                                                                                                                            1. Asset-based Prioritization
                                                                                                                                                                                                                              1. Threat Intelligence Integration

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                                                                                                                                                                                                                          6. Intrusion Prevention Systems

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                                                                                                                                                                                                                          8. Evasion Techniques and Countermeasures