Delta Android Keysystem Link May 2026

Delta Android KeySystem Link — Brief Overview

• Purpose: Delta's Android KeySystem Link is an integration pattern that connects an Android app's local key-management (keystore) with a remote key provisioning or synchronization service, enabling secure storage, rotation, and usage of cryptographic keys across devices or sessions.

• Adds SE for Android key separation.
• Provides samsung.android.keystore.delta.DeltaKeyStore class for per‑update key migration.

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• Verifying delta patches using a key stored in hardware.
• Signing delta metadata or applying encrypted deltas.
• Attesting device state before/after delta application.

3.1 Components

1. Update Verifier – calls KeyStore.get("update_key") and verifies delta manifest signature.
2. Delta Generator – signs delta blocks with private key corresponding to update_key.
3. Keymaster HAL – enforces key usage policies (only for OTA).
4. Rollback Index – stored in RPMB or secure counter.