TietAI Healthcare Integration Platform

Security Overview

Healthcare data requires the highest level of security. Our platform implements multiple layers of security:

Authentication & Authorization: Multi-factor authentication and role-based access control
Data Encryption: Encryption at rest and in transit
Network Security: VPN, firewall, and network isolation
Audit Logging: Comprehensive audit trails
Compliance: HIPAA, HITECH, and other healthcare regulations

Authentication & Authorization

Multi-Factor Authentication (MFA)

Enable MFA for All Users

{
  "security": {
    "mfa": {
      "enabled": true,
      "required_for_admin": true,
      "methods": ["totp", "sms", "email"],
      "backup_codes": true
    }
  }
}
            

Single Sign-On (SSO)

OAuth2/OpenID Connect

{
  "oauth2": {
    "providers": {
      "microsoft": {
        "client_id": "your-client-id",
        "client_secret": "your-client-secret",
        "tenant_id": "your-tenant-id",
        "authority": "https://login.microsoftonline.com/{tenant_id}",
        "scopes": ["openid", "profile", "email"]
      },
      "google": {
        "client_id": "your-google-client-id",
        "client_secret": "your-google-client-secret",
        "redirect_uri": "https://your-platform.tietai.com/auth/google/callback"
      }
    }
  }
}
            

Role-Based Access Control (RBAC)

User Roles

Role	Permissions
SUPER_ADMIN	Full system access
ORG_ADMIN	Organization management
INTEGRATION_MANAGER	Integration management
VIEWER	Read-only access
AUDITOR	Audit log access only

Data Encryption

Encryption at Rest

Database Encryption

-- PostgreSQL TDE (Transparent Data Encryption)
-- Enable encryption for the entire database
CREATE DATABASE healthcare_integration WITH ENCRYPTION;

-- Encrypt specific columns
CREATE TABLE patient_data (
    id UUID PRIMARY KEY,
    encrypted_ssn BYTEA, -- Store encrypted SSN
    encrypted_dob BYTEA  -- Store encrypted date of birth
);

-- Use pgcrypto for column-level encryption
CREATE EXTENSION pgcrypto;

-- Insert encrypted data
INSERT INTO patient_data (id, encrypted_ssn, encrypted_dob)
VALUES (
    gen_random_uuid(),
    pgp_sym_encrypt('123-45-6789', 'encryption_key'),
    pgp_sym_encrypt('1980-01-01', 'encryption_key')
);
            

File System Encryption

# LUKS encryption for data directories
cryptsetup luksFormat /dev/sdb
cryptsetup luksOpen /dev/sdb encrypted_storage

# Mount encrypted volume
mkfs.ext4 /dev/mapper/encrypted_storage
mount /dev/mapper/encrypted_storage /var/lib/tietai-healthcare-integration

# Auto-mount on boot
echo "encrypted_storage /var/lib/tietai-healthcare-integration ext4 defaults 0 2" >> /etc/fstab
            

Encryption in Transit

TLS Configuration

# NGINX TLS Configuration
server {
    listen 443 ssl http2;
    
    # SSL certificates
    ssl_certificate /etc/ssl/certs/tietai-healthcare-integration.crt;
    ssl_certificate_key /etc/ssl/private/tietai-healthcare-integration.key;
    
    # SSL protocols and ciphers
    ssl_protocols TLSv1.2 TLSv1.3;
    ssl_ciphers ECDHE-RSA-AES256-GCM-SHA512:DHE-RSA-AES256-GCM-SHA512:ECDHE-RSA-AES256-GCM-SHA384;
    ssl_prefer_server_ciphers off;
    
    # HSTS
    add_header Strict-Transport-Security "max-age=63072000; includeSubDomains; preload";
    
    # SSL session settings
    ssl_session_cache shared:SSL:10m;
    ssl_session_timeout 10m;
    
    # OCSP stapling
    ssl_stapling on;
    ssl_stapling_verify on;
}
            

Network Security

Firewall Configuration

UFW Configuration

# Reset UFW
ufw --force reset

# Default policies
ufw default deny incoming
ufw default allow outgoing

# SSH (restrict to management network)
ufw allow from 10.0.0.0/8 to any port 22

# HTTPS only
ufw allow 443/tcp

# Application monitoring
ufw allow from 10.0.1.0/24 to any port 9090  # Prometheus
ufw allow from 10.0.1.0/24 to any port 3000  # Grafana

# Healthcare system networks
ufw allow from 192.168.100.0/24 to any port 2575  # HL7 MLLP (see https://www.hl7.org/implement/standards/product_brief.cfm?product_id=185)

# Enable firewall
ufw enable
            

VPN Configuration

WireGuard VPN Setup

# /etc/wireguard/wg0.conf
[Interface]
PrivateKey = server_private_key
Address = 10.8.0.1/24
ListenPort = 51820
PostUp = iptables -A FORWARD -i %i -j ACCEPT; iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE
PostDown = iptables -D FORWARD -i %i -j ACCEPT; iptables -t nat -D POSTROUTING -o eth0 -j MASQUERADE

# Healthcare system peer
[Peer]
PublicKey = client_public_key
AllowedIPs = 192.168.100.0/24
Endpoint = hospital.example.com:51820
PersistentKeepalive = 25
            

Network Segmentation

VLAN Configuration

# Create VLANs for different tiers
ip link add link eth0 name eth0.100 type vlan id 100  # Web tier
ip link add link eth0 name eth0.200 type vlan id 200  # App tier
ip link add link eth0 name eth0.300 type vlan id 300  # DB tier

# Configure IP addresses
ip addr add 10.0.1.10/24 dev eth0.100  # Web tier
ip addr add 10.0.2.10/24 dev eth0.200  # App tier
ip addr add 10.0.3.10/24 dev eth0.300  # DB tier

# Bring interfaces up
ip link set eth0.100 up
ip link set eth0.200 up
ip link set eth0.300 up
            

Audit Logging

Comprehensive Audit Trail

class AuditLogger:
    def __init__(self):
        self.logger = logging.getLogger('audit')
        handler = logging.handlers.SysLogHandler(address='/dev/log')
        formatter = logging.Formatter(
            'AUDIT: %(asctime)s %(message)s',
            datefmt='%Y-%m-%d %H:%M:%S'
        )
        handler.setFormatter(formatter)
        self.logger.addHandler(handler)
        self.logger.setLevel(logging.INFO)
    
    def log_event(self, event_type: str, user_id: str, resource: str, 
                  action: str, result: str, details: dict = None):
        audit_entry = {
            "timestamp": datetime.utcnow().isoformat(),
            "event_type": event_type,
            "user_id": user_id,
            "resource": resource,
            "action": action,
            "result": result,
            "ip_address": self.get_client_ip(),
            "user_agent": self.get_user_agent(),
            "details": details or {}
        }
        
        self.logger.info(json.dumps(audit_entry))
            

Database Audit Logging

-- PostgreSQL audit logging using pgAudit
CREATE EXTENSION pgaudit;

-- Configure audit settings
ALTER SYSTEM SET pgaudit.log = 'all';
ALTER SYSTEM SET pgaudit.log_catalog = off;
ALTER SYSTEM SET pgaudit.log_parameter = on;
ALTER SYSTEM SET pgaudit.log_statement_once = on;
SELECT pg_reload_conf();

-- Create audit table for application events
CREATE TABLE audit_log (
    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
    timestamp TIMESTAMP WITH TIME ZONE DEFAULT NOW(),
    user_id UUID,
    event_type VARCHAR(50),
    resource_type VARCHAR(50),
    resource_id VARCHAR(255),
    action VARCHAR(50),
    result VARCHAR(20),
    ip_address INET,
    user_agent TEXT,
    details JSONB
);

-- Index for efficient querying
CREATE INDEX idx_audit_log_timestamp ON audit_log(timestamp);
CREATE INDEX idx_audit_log_user ON audit_log(user_id);
CREATE INDEX idx_audit_log_resource ON audit_log(resource_type, resource_id);
            

HIPAA Compliance

Business Associate Agreement (BAA)

Ensure all third-party services have signed BAAs:

Service	BAA Status	BAA Date
Cloud Provider (AWS/Azure/GCP)	Signed	2024-01-01
Monitoring Service (DataDog/New Relic)	Signed	2024-01-15
Email Service (SendGrid/Mailgun)	Signed	2024-02-01

Minimum Necessary Standard

Implement data minimization:

class DataMinimization:
    @staticmethod
    def filter_phi_fields(data: dict, user_role: str, purpose: str) -> dict:
        """Filter PHI based on minimum necessary standard"""
        
        # Define field access levels
        field_access = {
            "viewer": ["id", "name", "gender", "age_range"],
            "nurse": ["id", "name", "gender", "birth_date", "address"],
            "doctor": ["id", "name", "gender", "birth_date", "address", "ssn", "phone"],
            "admin": ["*"]  # All fields
        }
        
        allowed_fields = field_access.get(user_role, [])
        
        if "*" in allowed_fields:
            return data
        
        return {k: v for k, v in data.items() if k in allowed_fields}
            

Security Scanning

Vulnerability Assessment

# Security scanning configuration
security_scans:
  static_analysis:
    tool: "bandit"
    schedule: "daily"
    config: |
      [bandit]
      exclude_dirs = ["tests", "venv"]
      skips = ["B101"]  # Skip assert_used test
  
  dependency_scan:
    tool: "safety"
    schedule: "daily"
    command: "safety check --json"
  
  container_scan:
    tool: "trivy"
    schedule: "on_build"
    command: "trivy image healthcare-integration:latest"
  
  infrastructure_scan:
    tool: "nmap"
    schedule: "weekly"
    targets: ["10.0.0.0/8"]
            

Automated Security Testing

#!/bin/bash
# security-scan.sh

# Static code analysis
echo "Running static analysis..."
bandit -r app/ -f json -o security-report.json

# Dependency vulnerability check
echo "Checking dependencies..."
safety check --json --output dependency-report.json

# Container security scan
echo "Scanning container..."
trivy image --format json --output container-report.json healthcare-integration:latest

# SSL/TLS configuration check
echo "Checking SSL configuration..."
testssl.sh --jsonfile ssl-report.json https://your-platform.tietai.com

# Generate combined report
python generate_security_report.py
            

Best Practices

Secure Development

Code Review: All code changes require security review
Input Validation: Validate all inputs at application boundaries
Output Encoding: Encode outputs to prevent injection attacks
Error Handling: Don't expose sensitive information in error messages
Dependency Management: Keep dependencies updated and scan for vulnerabilities

Operational Security

Principle of Least Privilege: Grant minimum necessary permissions
Defense in Depth: Implement multiple layers of security
Regular Updates: Keep all systems and software updated
Monitoring: Continuous monitoring of security events
Backup Security: Secure and test backup systems regularly

Data Protection

Data Classification: Classify data based on sensitivity
Encryption: Encrypt all sensitive data at rest and in transit
Access Logging: Log all access to sensitive data
Data Retention: Implement and enforce data retention policies
Secure Disposal: Securely delete data when no longer needed

Compliance Monitoring

# Compliance monitoring dashboard
class ComplianceMonitor:
    def generate_compliance_report(self) -> dict:
        return {
            "hipaa_compliance": {
                "encryption_at_rest": self.check_encryption_at_rest(),
                "encryption_in_transit": self.check_encryption_in_transit(),
                "access_controls": self.check_access_controls(),
                "audit_logging": self.check_audit_logging(),
                "staff_training": self.check_staff_training_records()
            },
            "technical_safeguards": {
                "unique_user_identification": True,
                "automatic_logoff": True,
                "encryption_decryption": True
            },
            "administrative_safeguards": {
                "security_officer": True,
                "workforce_training": True,
                "information_access_management": True
            },
            "physical_safeguards": {
                "facility_access_controls": True,
                "workstation_controls": True,
                "device_controls": True
            }
        }
            

This security guide provides a comprehensive foundation for securing your TietAI Healthcare Integration Platform. Regular security assessments, updates to security policies, and staff training are essential for maintaining a secure environment.