iOS Security Architecture Overview

iOS security is built on multiple layers, each providing specific protections. Understanding this architecture is essential for implementing effective security measures in your applications.

Hardware Security Foundation:

Secure Enclave: A dedicated coprocessor that handles cryptographic operations and stores sensitive data
Secure Boot Chain: Ensures only Apple-signed code runs during startup
Dedicated AES Engine: Hardware-accelerated encryption for file system protection
True Random Number Generator: Provides cryptographically secure random numbers
Secure Element: Stores payment and identity credentials

Software Security Layers: The iOS security model implements defense-in-depth through multiple software layers:

Mandatory code signing for all executables
Sandboxing that isolates apps from each other
Entitlements that control access to system resources
Data Protection API for automatic file encryption
Keychain Services for secure credential storage