This document outlines security best practices for using and deploying the Jules Mobile Client.

DO:

• ✅ Store API keys using the app's secure storage (expo-secure-store)
• ✅ Never share your API key with others
• ✅ Rotate your API key if you suspect it's been compromised
• ✅ Use API keys with minimal required permissions
• ✅ Monitor your API usage in Google Cloud Console

DON'T:

• ❌ Never commit API keys to version control
• ❌ Never share screenshots containing API keys
• ❌ Never use personal API keys on shared devices without clearing them afterwards
• ❌ Never store API keys in plain text files

For production or team deployments, consider:

1. Centralized Key Management

   • Use a backend service to manage API keys
   • Implement user authentication before providing keys
   • Rotate keys regularly
   • Monitor API usage and set alerts

2. API Key Scoping

   • Use different keys for different environments (dev/staging/prod)
   • Implement rate limiting per user/team
   • Set up budget alerts in Google Cloud Console

3. Access Control

   • Implement role-based access control (RBAC)
   • Log all API key access
   • Implement session timeouts

1. Secure Storage

   • API keys stored with expo-secure-store
   • Leverages platform-specific secure storage:
     • iOS: Keychain
     • Android: Keystore/EncryptedSharedPreferences

2. HTTPS Communication

   • All API requests use HTTPS
   • Certificate pinning (can be implemented if needed)

3. No Third-Party Data Sharing

   • No analytics or tracking by default
   • No data sent to third parties

4. Input Validation

   • User inputs are validated before API calls
   • XSS protection in markdown rendering

For production deployments, consider implementing:

1. Authentication & Authorization

   // Add user authentication layer
   - OAuth 2.0 / OIDC
   - Multi-factor authentication (MFA)
   - Session management

2. Network Security

   // Add certificate pinning
   - Verify SSL certificates
   - Implement timeout policies
   - Add retry logic with exponential backoff

3. Data Protection

   // Encrypt sensitive data
   - Encrypt local cache
   - Implement data retention policies
   - Add data export/deletion features

4. Audit Logging

   // Log security events
   - API key access/changes
   - Failed authentication attempts
   - Unusual API usage patterns

Before deploying to production, verify:

• API keys are never hardcoded
• Secure storage is used for sensitive data
• All API calls use HTTPS
• User inputs are validated and sanitized
• Error messages don't leak sensitive information
• Debug logging is disabled in production
• Dependencies are up to date
• Known vulnerabilities are patched
• Rate limiting is implemented
• API usage is monitored
• Incident response plan is in place
• Privacy policy is implemented (if required)
• Terms of service are displayed (if required)
• User data deletion mechanism exists (if applicable)

If you discover a security vulnerability:

1. DO NOT open a public GitHub issue
2. Email security concerns to: [Your contact email]
3. Include:
   • Description of the vulnerability
   • Steps to reproduce
   • Potential impact
   • Suggested fix (if any)

We aim to respond to security reports within 48 hours.

# Check for vulnerabilities
npm audit

# Update dependencies
npm update

# Update Expo SDK
npx expo upgrade

• Update dependencies monthly
• Review security advisories
• Patch known vulnerabilities promptly
• Test security updates before deploying

For commercial use, you may need to comply with:

• Implement data subject rights (access, deletion, portability)
• Add privacy policy
• Obtain user consent for data processing
• Implement data breach notification

• Provide privacy notice
• Allow users to opt-out of data selling (not applicable if no data is collected)
• Implement data deletion requests

• HIPAA (healthcare data) - Do NOT use for healthcare without proper safeguards
• SOC 2 - For enterprise customers
• ISO 27001 - Information security management

Note: This app is designed for development use. Consult legal counsel before using in regulated industries.

1. Environment Variables

   # Use environment-specific configs
   EXPO_PUBLIC_API_URL=https://jules.googleapis.com/v1alpha
   EXPO_PUBLIC_ENABLE_DEBUG=false

2. Build Security

   # Use production build profiles
   eas build --platform android --profile production
   
   # Enable code obfuscation
   # Enable ProGuard (Android)
   # Enable bitcode (iOS)

3. App Distribution

   • Sign APKs/IPAs with production certificates
   • Use official app stores when possible
   • Implement app integrity checks
   • Consider using internal distribution for enterprise

1. Network Security

   • Implement SSL pinning for API calls
   • Use VPN for sensitive data transmission
   • Implement request signing

2. Storage Security

   • Clear sensitive data on logout
   • Implement secure session management
   • Add biometric authentication option

3. Code Protection

   • Enable code obfuscation in production
   • Remove debug symbols
   • Disable developer tools

1. Static Analysis

   # ESLint with security rules
   npm install --save-dev eslint-plugin-security
   
   # TypeScript strict mode
   # Already enabled in tsconfig.json

2. Dependency Scanning

   # npm audit
   npm audit
   
   # Snyk
   npm install -g snyk
   snyk test

3. Runtime Protection

   • Expo EAS Build with security features
   • App shielding solutions (for high-security needs)
   • Runtime application self-protection (RASP)

• Expo Security Documentation
• React Native Security Guide
• OWASP Mobile Security
• Google Cloud Security Best Practices

What this app does NOT provide:

• User authentication system
• Backend API for key management
• Compliance certifications
• Security incident response
• Penetration testing
• Security audits

For enterprise/commercial use:

• Implement additional security layers
• Conduct security audits
• Add monitoring and alerting
• Implement backup and disaster recovery
• Establish incident response procedures

Last Updated: 2025-02-13

Disclaimer: This document provides general security guidance. Consult security professionals for production deployments.