Security Architecture

Security design and controls for HealthTalk.

Security Layers

Network Security

• All traffic encrypted via TLS 1.3
• Web Application Firewall (WAF)
• DDoS protection
• Network segmentation

Application Security

• Input validation and sanitization
• Output encoding
• CSRF protection
• Content Security Policy

Data Security

• Encryption at rest (AES-256)
• Encryption in transit (TLS 1.3)
• Key management via HSM
• Data masking for non-production

Identity & Access

• Multi-factor authentication
• Role-based access control
• Single Sign-On (SSO) support
• Session management

Authentication Flow

User ──> Identity Provider ──> JWT Token ──> Gateway ──> Services
              │
              └──> MFA Challenge (if enabled)

Authorization Model

Role Hierarchy

Organization Admin
    │
    ├── Department Admin
    │       │
    │       ├── Clinician
    │       │
    │       └── Staff
    │
    └── Viewer

Permission Model

Permissions are assigned at:

• Organization level
• Department level
• Resource level (specific patients, templates)

Secrets Management

• API keys stored in encrypted vault
• Automatic rotation policies
• Access logging for all secret access
• Separation of production secrets

Security Monitoring

• Real-time threat detection
• Anomaly detection on API usage
• Failed authentication alerting
• Security event logging

Vulnerability Management

• Regular penetration testing
• Automated dependency scanning
• Security code reviews
• Bug bounty program