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iOS and Android have converged on similar primitives (app sandbox, capability-based permissions, signed code, encrypted storage) but reach them differently. iOS: closed ecosystem, all apps from App Store, sandboxing strict, kernel patches Apple-controlled. Android: open ecosystem, Google Play + sideload, AOSP + vendor forks, kernel update lag.
iOS sandbox: every app runs in its own container, file access through entitlements. Cross-app communication via deep links, share sheets, XPC. Android: similar sandbox per UID, IPC via Intents + Binder. Storage Access Framework (modern Android) is converging toward iOS's strict model.
frida-server (Android) and an iOS jailbreak toolchain. Both are research tools for understanding what's enforced.Use these three in order. Each builds on the one before.
In one paragraph, contrast iOS and Android security models.
Walk me through how an iOS app's entitlement is checked at runtime.
Design an app deployment strategy for a security-sensitive product across both platforms.