CensusChat Security Architecture

CensusChat Security Architecture

Overview

CensusChat implements a defense-in-depth security architecture designed to protect user data, prevent unauthorized access, and maintain compliance with enterprise security standards. The architecture follows zero-trust principles with multiple layers of protection across application, data, and infrastructure components.

Security Architecture Overview

graph TB
    subgraph "Client Layer Security"
        HTTPS[HTTPS/TLS 1.3<br/>Certificate Pinning<br/>HSTS Headers]
        CSP[Content Security Policy<br/>XSS Protection<br/>CSRF Tokens]
        AUTH_CLIENT[Client Authentication<br/>JWT Tokens<br/>Refresh Rotation]
    end
    
    subgraph "Network Security"
        WAF[Web Application Firewall<br/>DDoS Protection<br/>IP Filtering]
        LOAD_BALANCER[Load Balancer<br/>SSL Termination<br/>Health Checks]
        VPC[Virtual Private Cloud<br/>Network Segmentation<br/>Security Groups]
    end
    
    subgraph "Application Security"
        API_GATEWAY[API Gateway<br/>Rate Limiting<br/>Input Validation]
        RBAC[Role-Based Access<br/>Permission Matrix<br/>Resource Controls]
        SQL_PROTECTION[SQL Injection Protection<br/>Query Validation<br/>Parameterized Queries]
    end
    
    subgraph "Data Security"
        ENCRYPTION_TRANSIT[Encryption in Transit<br/>TLS 1.3<br/>mTLS Service Mesh]
        ENCRYPTION_REST[Encryption at Rest<br/>AES-256<br/>Key Rotation]
        DATA_MASKING[Data Masking<br/>PII Protection<br/>Anonymization]
    end
    
    subgraph "Infrastructure Security"
        IAM[Identity & Access Mgmt<br/>Principle of Least Privilege<br/>Multi-Factor Auth]
        SECRETS[Secrets Management<br/>HashiCorp Vault<br/>Key Rotation]
        MONITORING[Security Monitoring<br/>SIEM Integration<br/>Anomaly Detection]
    end
    
    subgraph "Compliance & Governance"
        AUDIT[Audit Logging<br/>Immutable Logs<br/>Compliance Reports]
        BACKUP[Secure Backup<br/>Encrypted Storage<br/>Access Controls]
        INCIDENT[Incident Response<br/>Automated Containment<br/>Forensics Ready]
    end
    
    %% Security Flow
    HTTPS --> WAF
    CSP --> WAF
    AUTH_CLIENT --> API_GATEWAY
    
    WAF --> LOAD_BALANCER
    LOAD_BALANCER --> VPC
    VPC --> API_GATEWAY
    
    API_GATEWAY --> RBAC
    RBAC --> SQL_PROTECTION
    
    SQL_PROTECTION --> ENCRYPTION_TRANSIT
    ENCRYPTION_TRANSIT --> ENCRYPTION_REST
    ENCRYPTION_REST --> DATA_MASKING
    
    DATA_MASKING --> IAM
    IAM --> SECRETS
    SECRETS --> MONITORING
    
    MONITORING --> AUDIT
    AUDIT --> BACKUP
    BACKUP --> INCIDENT
    
    %% Styling
    classDef client fill:#e3f2fd
    classDef network fill:#f3e5f5
    classDef application fill:#e8f5e8
    classDef data fill:#fff3e0
    classDef infrastructure fill:#ffebee
    classDef compliance fill:#f1f8e9
    
    class HTTPS,CSP,AUTH_CLIENT client
    class WAF,LOAD_BALANCER,VPC network
    class API_GATEWAY,RBAC,SQL_PROTECTION application
    class ENCRYPTION_TRANSIT,ENCRYPTION_REST,DATA_MASKING data
    class IAM,SECRETS,MONITORING infrastructure
    class AUDIT,BACKUP,INCIDENT compliance

Authentication and Authorization

Multi-Factor Authentication Framework

Authentication Flow:

sequenceDiagram
    participant User as User Client
    participant Gateway as API Gateway
    participant Auth as Auth Service
    participant MFA as MFA Service
    participant IAM as Identity Provider
    participant Token as Token Store
    
    User->>Gateway: Login Request
    Gateway->>Auth: Validate Credentials
    Auth->>IAM: Verify Identity
    IAM->>Auth: Identity Confirmed
    Auth->>MFA: Trigger MFA Challenge
    MFA->>User: Send MFA Code (SMS/TOTP)
    User->>MFA: Submit MFA Code
    MFA->>Auth: MFA Verified
    Auth->>Token: Generate JWT + Refresh Token
    Token->>Auth: Tokens Created
    Auth->>Gateway: Return Tokens
    Gateway->>User: Authentication Success
    
    Note over User,Token: Subsequent API Requests
    User->>Gateway: API Request + JWT
    Gateway->>Auth: Validate JWT
    Auth->>Gateway: Token Valid
    Gateway->>User: Authorized Response
    
    Note over User,Token: Token Refresh
    User->>Gateway: Refresh Token Request
    Gateway->>Auth: Validate Refresh Token
    Auth->>Token: Generate New JWT
    Token->>Auth: New JWT Created
    Auth->>Gateway: New JWT
    Gateway->>User: Refreshed Token

Authentication Methods:

Primary Authentication:
  OAuth 2.0 Providers:
    - Google OAuth 2.0 (OpenID Connect)
    - Microsoft Azure AD / Office 365
    - GitHub OAuth (for developer accounts)
    - Custom SAML 2.0 for enterprise customers
  
  Username/Password:
    - bcrypt hashing with salt (cost factor: 12)
    - Password complexity requirements
    - Account lockout after 5 failed attempts
    - Password history tracking (last 12 passwords)

Multi-Factor Authentication:
  Time-based OTP (TOTP):
    - RFC 6238 compliant (Google Authenticator, Authy)
    - 30-second time windows with 1 window tolerance
    - Base32 encoded secrets with 160-bit entropy
    - Backup codes (8 single-use codes)
  
  SMS Authentication:
    - Twilio integration with rate limiting
    - Geographic restrictions for high-risk countries
    - Fallback for users without TOTP capability
    - Message encryption and audit logging

Enterprise Authentication:
  SAML 2.0:
    - Identity Provider initiated (IdP) and Service Provider (SP) flows
    - Attribute mapping for user roles and permissions
    - Digital signature validation and encryption
    - Support for major enterprise IdPs (Okta, Ping, ADFS)
  
  LDAP Integration:
    - Secure LDAP (LDAPS) connections
    - Active Directory group mapping
    - Nested group support for complex organizations
    - Connection pooling and failover

Role-Based Access Control (RBAC)

Permission Matrix:

Role Definitions:
  Anonymous:
    - View public documentation
    - Access free tier query limits (100 queries/month)
    - No data export capabilities
    - Community support only

  Individual Professional:
    - Unlimited queries with priority processing
    - All export formats (CSV, JSON, Excel, PDF)
    - Basic collaboration features
    - Email support with 24-hour SLA

  Team Member:
    - All Professional features
    - Team workspace access
    - Advanced collaboration and sharing
    - Query template sharing within organization
    - Priority phone support

  Team Administrator:
    - All Team Member features
    - User management within organization
    - Billing and subscription management
    - Usage analytics and reporting
    - Team security settings configuration

  Organization Administrator:
    - All Team Administrator features
    - Multi-team management
    - Advanced security configurations
    - Audit log access and export
    - Custom integration management

  System Administrator:
    - Full system access and configuration
    - User account management across organizations
    - System monitoring and performance metrics
    - Security incident response tools
    - Platform configuration and feature flags

Resource Access Control:

graph TB
    subgraph "Access Control Matrix"
        subgraph "Resources"
            QUERIES[Query Execution<br/>Census Data Access]
            EXPORTS[Data Export<br/>Multiple Formats]
            TEAMS[Team Management<br/>User Administration]
            ANALYTICS[Usage Analytics<br/>Performance Metrics]
            CONFIG[System Configuration<br/>Security Settings]
        end
        
        subgraph "Roles"
            ANON[Anonymous<br/>Public Access]
            PROF[Professional<br/>Individual User]
            TEAM_MEM[Team Member<br/>Organization User]
            TEAM_ADMIN[Team Admin<br/>Organization Manager]
            ORG_ADMIN[Org Admin<br/>Multi-Team Manager]
            SYS_ADMIN[System Admin<br/>Platform Manager]
        end
        
        subgraph "Permissions"
            READ[Read<br/>View Only]
            WRITE[Write<br/>Create/Update]
            DELETE[Delete<br/>Remove Data]
            ADMIN[Admin<br/>Full Control]
        end
    end
    
    %% Permission mappings
    ANON --> READ
    READ --> QUERIES
    
    PROF --> WRITE
    WRITE --> QUERIES
    WRITE --> EXPORTS
    
    TEAM_MEM --> WRITE
    TEAM_MEM --> READ
    READ --> TEAMS
    
    TEAM_ADMIN --> DELETE
    DELETE --> TEAMS
    WRITE --> ANALYTICS
    
    ORG_ADMIN --> ADMIN
    ADMIN --> TEAMS
    ADMIN --> ANALYTICS
    
    SYS_ADMIN --> ADMIN
    ADMIN --> CONFIG
    ADMIN --> QUERIES
    ADMIN --> EXPORTS

Data Protection and Encryption

Encryption Standards

Encryption at Rest:

Database Encryption:
  DuckDB:
    - AES-256-GCM encryption for data files
    - Transparent Data Encryption (TDE) implementation
    - Key rotation every 90 days
    - Hardware Security Module (HSM) key storage
  
  PostgreSQL:
    - AES-256 encryption with pgcrypto extension
    - Column-level encryption for sensitive fields
    - Tablespace encryption for user data
    - Automated key rotation with zero downtime
  
  Redis:
    - AES-256 encryption for RDB and AOF files
    - Memory encryption for in-transit cache data
    - SSL/TLS for inter-node communication
    - Encrypted backup and restore procedures

File Storage Encryption:
  AWS S3:
    - Server-Side Encryption with KMS (SSE-KMS)
    - Customer Master Keys (CMK) with annual rotation
    - Bucket-level default encryption policies
    - Cross-region replication with encryption
  
  Backup Storage:
    - AES-256 encryption for all backup files
    - Separate encryption keys for different data types
    - Immutable backups with encryption validation
    - Geographic distribution with encrypted transport

Encryption in Transit:

Network Encryption:
  External Communications:
    - TLS 1.3 for all client-server communications
    - Certificate pinning for mobile applications
    - HTTP Strict Transport Security (HSTS)
    - Perfect Forward Secrecy (PFS) with ECDHE

  Internal Service Communications:
    - Mutual TLS (mTLS) between microservices
    - Service mesh encryption with Istio
    - Certificate-based service authentication
    - Automatic certificate rotation and management

  Database Connections:
    - SSL/TLS for all database connections
    - Certificate-based authentication
    - Connection encryption with AES-256
    - Regular SSL certificate rotation

API Security:
  Request/Response Encryption:
    - JWT token encryption with RS256 signatures
    - Request payload encryption for sensitive data
    - Response data encryption for export functions
    - API key encryption and secure storage

Key Management Architecture

Key Management System:

graph TB
    subgraph "Key Management Hierarchy"
        ROOT_KEY[Root Key<br/>Hardware Security Module<br/>Master Key Encryption]
        
        subgraph "Data Encryption Keys"
            DB_KEYS[Database Keys<br/>Per-Service Keys<br/>90-day Rotation]
            FILE_KEYS[File Storage Keys<br/>Per-Bucket Keys<br/>Annual Rotation]
            BACKUP_KEYS[Backup Keys<br/>Per-Backup Keys<br/>Immutable]
        end
        
        subgraph "Application Keys"
            JWT_KEYS[JWT Signing Keys<br/>RS256 Key Pairs<br/>30-day Rotation]
            API_KEYS[API Keys<br/>Per-User Keys<br/>User-Controlled]
            SESSION_KEYS[Session Keys<br/>Temporary Keys<br/>24-hour Expiry]
        end
        
        subgraph "Infrastructure Keys"
            TLS_KEYS[TLS Certificates<br/>Domain Certificates<br/>Annual Renewal]
            SERVICE_KEYS[Service Certificates<br/>mTLS Certificates<br/>90-day Rotation]
            SSH_KEYS[Access Keys<br/>Infrastructure Access<br/>Regular Rotation]
        end
    end
    
    ROOT_KEY --> DB_KEYS
    ROOT_KEY --> FILE_KEYS
    ROOT_KEY --> BACKUP_KEYS
    ROOT_KEY --> JWT_KEYS
    ROOT_KEY --> API_KEYS
    ROOT_KEY --> SESSION_KEYS
    ROOT_KEY --> TLS_KEYS
    ROOT_KEY --> SERVICE_KEYS
    ROOT_KEY --> SSH_KEYS
    
    %% Styling
    classDef root fill:#ffcdd2
    classDef data fill:#e8f5e8
    classDef app fill:#e3f2fd
    classDef infra fill:#fff3e0
    
    class ROOT_KEY root
    class DB_KEYS,FILE_KEYS,BACKUP_KEYS data
    class JWT_KEYS,API_KEYS,SESSION_KEYS app
    class TLS_KEYS,SERVICE_KEYS,SSH_KEYS infra

Key Rotation Procedures:

Automated Rotation:
  JWT Signing Keys:
    - Rotation schedule: Every 30 days
    - Graceful transition with overlapping validity
    - Automatic distribution to all services
    - Validation and rollback procedures

  Database Encryption Keys:
    - Rotation schedule: Every 90 days
    - Zero-downtime rotation with key versioning
    - Background re-encryption of existing data
    - Performance monitoring during rotation

  TLS Certificates:
    - Automatic renewal 30 days before expiration
    - Let's Encrypt integration for domain certificates
    - Certificate Transparency logging
    - Monitoring and alerting for renewal failures

Manual Rotation Triggers:
  - Security incident or suspected compromise
  - Employee departure with administrative access
  - Quarterly security audits and reviews
  - Compliance requirement changes
  - System migration or major updates

Network Security

Perimeter Security

Web Application Firewall (WAF):

DDoS Protection:
  - Layer 3/4 DDoS mitigation up to 100 Gbps
  - Layer 7 application-level attack protection
  - Rate limiting per IP and geographic region
  - Behavioral analysis for bot detection

Application Security Rules:
  - OWASP Top 10 protection rules
  - SQL injection prevention with pattern matching
  - Cross-site scripting (XSS) prevention
  - Cross-site request forgery (CSRF) protection
  - File upload restrictions and scanning

Geographic Restrictions:
  - Country-level blocking for high-risk regions
  - IP reputation filtering with threat intelligence
  - Suspicious activity pattern detection
  - Whitelist management for trusted sources

Custom Security Rules:
  - API endpoint specific rate limiting
  - Query complexity analysis and blocking
  - User behavior anomaly detection
  - Custom attack signature development

Network Segmentation:

graph TB
    subgraph "DMZ (Public Network)"
        WAF_DMZ[Web Application Firewall<br/>Public Internet Access]
        LB_DMZ[Load Balancer<br/>SSL Termination]
    end
    
    subgraph "Application Network"
        API_NET[API Gateway<br/>Application Services]
        WEB_NET[Web Servers<br/>Static Content]
    end
    
    subgraph "Service Network"
        MICRO_NET[Microservices<br/>Internal APIs]
        CACHE_NET[Cache Layer<br/>Redis Cluster]
    end
    
    subgraph "Data Network"
        DB_NET[Database Servers<br/>Primary Data Storage]
        BACKUP_NET[Backup Systems<br/>Disaster Recovery]
    end
    
    subgraph "Management Network"
        MONITOR_NET[Monitoring<br/>Logging Systems]
        ADMIN_NET[Administrative<br/>Management Tools]
    end
    
    %% Network flows with security groups
    WAF_DMZ --> LB_DMZ
    LB_DMZ --> API_NET
    LB_DMZ --> WEB_NET
    
    API_NET --> MICRO_NET
    MICRO_NET --> CACHE_NET
    MICRO_NET --> DB_NET
    
    DB_NET --> BACKUP_NET
    
    MICRO_NET -.-> MONITOR_NET
    API_NET -.-> MONITOR_NET
    DB_NET -.-> ADMIN_NET
    
    %% Security group rules
    WAF_DMZ -.-> |"Ports: 80, 443<br/>Protocol: HTTP/HTTPS"| LB_DMZ
    LB_DMZ -.-> |"Ports: 3000, 8080<br/>Protocol: HTTP"| API_NET
    API_NET -.-> |"Ports: 8001-8008<br/>Protocol: HTTP"| MICRO_NET
    MICRO_NET -.-> |"Port: 6379<br/>Protocol: Redis"| CACHE_NET
    MICRO_NET -.-> |"Port: 5432<br/>Protocol: PostgreSQL"| DB_NET

API Security

API Gateway Security:

Authentication:
  - JWT token validation with public key verification
  - API key authentication for service-to-service calls
  - OAuth 2.0 client credentials flow for third-party integrations
  - Rate limiting per authenticated user and API key

Input Validation:
  - JSON schema validation for all request payloads
  - Parameter type checking and range validation
  - SQL injection prevention through parameterized queries
  - Cross-site scripting (XSS) prevention with input sanitization

Rate Limiting:
  Tier-based Limits:
    - Free Tier: 100 requests/hour, 5 requests/minute
    - Professional: 10,000 requests/hour, 100 requests/minute
    - Team: 50,000 requests/hour, 500 requests/minute
    - Enterprise: Custom limits based on agreement
  
  Adaptive Rate Limiting:
    - Dynamic limits based on system load
    - Burst capacity for occasional peak usage
    - IP-based rate limiting for suspicious activity
    - Geographic rate limiting for high-risk regions

Query Security:
  SQL Injection Prevention:
    - Whitelist-based SQL generation
    - Parameterized query templates only
    - Abstract Syntax Tree (AST) parsing and validation
    - Query complexity analysis and limits
  
  Data Access Controls:
    - Row-level security based on user permissions
    - Column-level access control for sensitive data
    - Query result size limits (max 1M rows)
    - Query timeout enforcement (30 seconds max)

API Monitoring and Threat Detection:

Security Monitoring:
  Real-time Threat Detection:
    - Anomalous request pattern identification
    - Brute force attack detection and blocking
    - Distributed attack correlation across IPs
    - Machine learning-based behavior analysis

  Security Metrics:
    - Failed authentication attempts per minute
    - Unusual query patterns and complexity spikes
    - Geographic distribution of requests
    - Response time anomalies indicating attacks

  Automated Response:
    - Temporary IP blocking for suspicious activity
    - Account lockout for repeated failed attempts
    - Rate limit adjustments based on threat level
    - Security team notifications for critical events

Incident Response:
  - Automated log collection for security events
  - Forensics-ready data preservation
  - Incident escalation procedures
  - Post-incident analysis and improvement

Compliance and Governance

Compliance Framework

SOC 2 Type II Compliance:

Security Controls:
  - Access controls with multi-factor authentication
  - Network security with encryption and monitoring
  - System operations with change management
  - Logical and physical access controls
  - Risk assessment and mitigation procedures

Availability Controls:
  - System monitoring and incident response
  - Backup and disaster recovery procedures
  - Capacity planning and performance monitoring
  - Service level agreement (SLA) monitoring
  - Business continuity planning

Processing Integrity Controls:
  - Data validation and error checking
  - Quality assurance processes
  - Automated testing and deployment
  - Data processing authorization controls
  - System development lifecycle management

Confidentiality Controls:
  - Data classification and handling procedures
  - Encryption of data at rest and in transit
  - Secure data transmission protocols
  - Access logging and monitoring
  - Data retention and disposal policies

Privacy Controls (GDPR/CCPA):
  - Consent management and tracking
  - Data subject rights implementation
  - Privacy impact assessments
  - Data breach notification procedures
  - Third-party data processing agreements

Audit and Compliance Monitoring:

graph TB
    subgraph "Audit Data Sources"
        APP_LOGS[Application Logs<br/>User Actions<br/>API Calls]
        ACCESS_LOGS[Access Logs<br/>Authentication<br/>Authorization]
        SYSTEM_LOGS[System Logs<br/>Infrastructure<br/>Database Access]
        SECURITY_LOGS[Security Logs<br/>Incidents<br/>Threats]
    end
    
    subgraph "Log Aggregation"
        COLLECTOR[Log Collector<br/>Centralized Ingestion<br/>Real-time Processing]
        PARSER[Log Parser<br/>Structured Data<br/>Normalization]
        ENRICHER[Log Enricher<br/>Context Addition<br/>Correlation]
    end
    
    subgraph "Compliance Processing"
        AUDIT_ENGINE[Audit Engine<br/>Rule Processing<br/>Violation Detection]
        COMPLIANCE_CHECK[Compliance Checker<br/>SOC 2 / GDPR<br/>Policy Validation]
        REPORT_GEN[Report Generator<br/>Automated Reports<br/>Dashboard Updates]
    end
    
    subgraph "Storage and Retention"
        AUDIT_STORE[Audit Store<br/>Immutable Storage<br/>Long-term Retention]
        COMPLIANCE_DB[Compliance Database<br/>Structured Reports<br/>Query Access]
        ARCHIVE[Archive Storage<br/>7-year Retention<br/>Encrypted Backup]
    end
    
    %% Data flow
    APP_LOGS --> COLLECTOR
    ACCESS_LOGS --> COLLECTOR
    SYSTEM_LOGS --> COLLECTOR
    SECURITY_LOGS --> COLLECTOR
    
    COLLECTOR --> PARSER
    PARSER --> ENRICHER
    
    ENRICHER --> AUDIT_ENGINE
    AUDIT_ENGINE --> COMPLIANCE_CHECK
    COMPLIANCE_CHECK --> REPORT_GEN
    
    REPORT_GEN --> AUDIT_STORE
    AUDIT_STORE --> COMPLIANCE_DB
    COMPLIANCE_DB --> ARCHIVE

Data Privacy and Protection

GDPR Compliance Implementation:

Data Subject Rights:
  Right to Access:
    - User data export functionality
    - Complete data inventory reporting
    - Machine-readable format (JSON/CSV)
    - Response within 30 days of request

  Right to Rectification:
    - Self-service profile management
    - Data correction request workflow
    - Automated data consistency checks
    - Update propagation across systems

  Right to Erasure (Right to be Forgotten):
    - Complete account deletion functionality
    - Data anonymization for analytics retention
    - Third-party data deletion coordination
    - Verification and confirmation process

  Right to Data Portability:
    - Standardized data export formats
    - API access for data migration
    - Compatible format specifications
    - Secure transfer mechanisms

  Right to Object:
    - Marketing communication opt-out
    - Analytics data collection preferences
    - Automated decision-making opt-out
    - Granular consent management

Consent Management:
  - Explicit consent collection and tracking
  - Granular consent categories
  - Consent withdrawal mechanisms
  - Audit trail for consent changes
  - Regular consent refresh procedures

Data Retention and Disposal:

Retention Policies:
  User Account Data:
    - Active accounts: Indefinite retention during active use
    - Inactive accounts: 3 years after last login
    - Deleted accounts: 30-day grace period, then permanent deletion
    - Audit logs: 7 years for compliance requirements

  Application Data:
    - Query logs: 2 years for performance optimization
    - Error logs: 1 year for debugging and improvement
    - Analytics data: 3 years for trend analysis
    - Cached data: 24 hours to 7 days based on data type

  Backup Data:
    - Daily backups: 30-day retention
    - Weekly backups: 1-year retention
    - Monthly backups: 7-year retention
    - Archive data: Permanent retention with access controls

Secure Disposal:
  - Cryptographic erasure for encrypted data
  - Multi-pass overwriting for unencrypted storage
  - Physical destruction of decommissioned hardware
  - Certificate of destruction for sensitive data
  - Verification and documentation of disposal process

Incident Response and Security Operations

Security Incident Response Plan

Incident Classification:

Severity Levels:
  Critical (P0):
    - Data breach with PII exposure
    - Complete system compromise
    - Ransomware or destructive attacks
    - Response time: Immediate (< 15 minutes)

  High (P1):
    - Unauthorized access to sensitive data
    - Service disruption affecting all users
    - Suspected insider threat
    - Response time: < 1 hour

  Medium (P2):
    - Limited unauthorized access
    - Service degradation for subset of users
    - Security control failures
    - Response time: < 4 hours

  Low (P3):
    - Policy violations
    - Minor security misconfigurations
    - Failed login attempts exceeding thresholds
    - Response time: < 24 hours

Incident Types:
  - Data breaches and unauthorized access
  - Malware infections and compromised systems
  - Denial of service attacks
  - Insider threats and policy violations
  - Third-party security incidents
  - Physical security breaches

Incident Response Workflow:

graph TB
    DETECTION[Incident Detection<br/>Automated Alerts<br/>Manual Reports]
    
    subgraph "Initial Response"
        TRIAGE[Incident Triage<br/>Severity Assessment<br/>Team Notification]
        CONTAIN[Immediate Containment<br/>System Isolation<br/>Access Revocation]
        ASSESS[Initial Assessment<br/>Scope Determination<br/>Impact Analysis]
    end
    
    subgraph "Investigation"
        FORENSICS[Digital Forensics<br/>Evidence Collection<br/>Root Cause Analysis]
        TIMELINE[Timeline Construction<br/>Attack Reconstruction<br/>Damage Assessment]
        ATTRIBUTION[Threat Attribution<br/>Attack Vector Analysis<br/>IOC Collection]
    end
    
    subgraph "Response Actions"
        ERADICATE[Threat Eradication<br/>Malware Removal<br/>Vulnerability Patching]
        RECOVER[System Recovery<br/>Service Restoration<br/>Data Recovery]
        MONITOR[Enhanced Monitoring<br/>Threat Hunting<br/>Anomaly Detection]
    end
    
    subgraph "Post-Incident"
        DOCUMENT[Documentation<br/>Incident Report<br/>Lessons Learned]
        IMPROVE[Process Improvement<br/>Control Updates<br/>Training Updates]
        COMMUNICATE[Communication<br/>Stakeholder Updates<br/>Regulatory Reporting]
    end
    
    DETECTION --> TRIAGE
    TRIAGE --> CONTAIN
    CONTAIN --> ASSESS
    
    ASSESS --> FORENSICS
    FORENSICS --> TIMELINE
    TIMELINE --> ATTRIBUTION
    
    ATTRIBUTION --> ERADICATE
    ERADICATE --> RECOVER
    RECOVER --> MONITOR
    
    MONITOR --> DOCUMENT
    DOCUMENT --> IMPROVE
    IMPROVE --> COMMUNICATE

Security Operations Center (SOC)

24/7 Security Monitoring:

Monitoring Coverage:
  - Real-time threat detection and analysis
  - Security information and event management (SIEM)
  - User and entity behavior analytics (UEBA)
  - Threat intelligence integration and correlation

Staffing Model:
  - Tier 1 Analysts: Initial alert triage and response
  - Tier 2 Analysts: Deep investigation and analysis
  - Tier 3 Engineers: Advanced threat hunting and response
  - Security Manager: Coordination and escalation

Response Capabilities:
  - Automated incident response playbooks
  - Threat containment and isolation procedures
  - Forensic analysis and evidence preservation
  - Communication and reporting workflows

Metrics and KPIs:
  - Mean time to detection (MTTD): Target < 30 minutes
  - Mean time to response (MTTR): Target < 2 hours
  - False positive rate: Target < 5%
  - Threat containment rate: Target > 95%

This comprehensive security architecture ensures CensusChat maintains the highest levels of security while enabling seamless user experience and regulatory compliance across all customer segments and use cases.