Security is not a screen — it’s a system.

This project is a wallet-style Security Center subsystem built with SwiftUI. Instead of treating security as a collection of UI settings, it is designed as a first-class subsystem with clear ownership, explicit boundaries, and state-driven behavior.

The UI is intentionally simple — it is merely a projection of system state. The real complexity lives underneath, where security rules, state transitions, and policies are modeled explicitly.

SecurityCenter-SystemDesign Demo

• Passcode lifecycle
  • Create / Edit / Disable passcode
• Biometric authentication
  • Face ID / Touch ID support
• Randomized keypad
  • Protects against shoulder-surfing attacks
• Auto-lock policies
  • Immediate / 1 min / 5 min / 15 min / 30 min / 1 hour
• Retry limits & lockout
  • Limited attempts
  • Temporary lock after excessive failures
• Secure background protection
  • Automatic cover view when app enters background
• Unified unlock flow
  • Centralized handling for passcode, biometric, and fallback paths

This project models security as an independent domain layer, not UI-driven logic.

Security
├─ PasscodeManager // Passcode creation, validation, lifecycle
├─ BiometryManager // Face ID / Touch ID handling
├─ LockManager // Lock / unlock state
├─ LockoutManager // Retry limits & cooldown policy
├─ CoverManager // Background privacy overlay
├─ CoreSecurity // Central security gate & policy coordinator
└─ Views / ViewModels // State-driven UI layer

• Single Responsibility
  • Each security capability owns its own behavior and state
• Explicit Boundaries via Dependency Injection
  • Managers communicate through injected protocols
• State-driven UI
  • Views react to security state instead of deciding behavior
• Centralized Policy Control
  • All sensitive actions flow through CoreSecurity

Security features tend to grow organically and become fragile over time. By treating security as a subsystem:

• New policies can be added without touching existing UI
• Rules remain consistent across the app
• Behavior stays predictable as complexity increases
• The system becomes easier to test and reason about

With AI accelerating implementation, system boundaries and responsibility design are becoming the real differentiators.

• This repository focuses on system design and architecture
• UI is kept intentionally minimal to highlight behavioral correctness
• Designed for wallet / finance-style security requirements