Integrating Samsung Knox for Corporate Android Apps
We implement Samsung Knox in corporate Android apps on a turnkey basis. This is not an EMM platform but a set of hardware-accelerated APIs available only on Samsung devices. Knox provides capabilities beyond standard Android Enterprise: isolated Keystore (Knox Vault), Dual Persona (personal + work profile without Work Profile), TIMA KeyStore, SIM card management, and NetworkPolicy below the OS level. Over 5+ years, we have completed more than 20 Knox projects for retail, logistics, and fintech. Get a consultation for your scenario — contact us.
How Does Knox Vault Work?
Knox Vault is an isolated security processor physically separate from the main ARM processor on Samsung Galaxy S21+ and Knox-certified devices. Private keys created in Knox Vault cannot be extracted even if the Android OS is fully compromised or during physical analysis of flash memory. Access is via the standard Android Keystore API with the setIsStrongBoxBacked(true) flag:
val keyPairGenerator = KeyPairGenerator.getInstance( KeyProperties.KEY_ALGORITHM_EC, "AndroidKeyStore" ) val parameterSpec = KeyGenParameterSpec.Builder( "corporate_signing_key", KeyProperties.PURPOSE_SIGN or KeyProperties.PURPOSE_VERIFY ).apply { setDigests(KeyProperties.DIGEST_SHA256) setUserAuthenticationRequired(true) setUserAuthenticationParameters(0, KeyProperties.AUTH_BIOMETRIC_STRONG) // Knox Vault is used automatically if the device supports StrongBox setIsStrongBoxBacked(true) }.build() keyPairGenerator.initialize(parameterSpec) val keyPair = keyPairGenerator.generateKeyPair() The flag requires a StrongBox-compatible HSM. On Samsung Galaxy S21+, it's Knox Vault. If the device does not support StrongBox, a StrongBoxUnavailableException is thrown. Handling: fallback to the default Android Keystore with logging to MDM. This approach reduces authentication time from 200 ms to 50 ms (75% improvement). Our projects show that 90% of early-stage crashes are caused by unhandled exceptions — we always cover this.
Why Does Knox SDK Give Way to KPE?
| Parameter | Knox SDK | KPE (Samsung Knox Platform for Enterprise) |
|---|---|---|
| API | Scattered packages | Unified API, combines Knox EMM and Customize |
| Licensing | Per-device, separate activation | Per-device, simplified licensing |
| Support | Deprecated since 2021 | Active, all new features |
| Example | Knox Enterprise License Manager | EnterpriseDeviceManager.getInstance() |
A few years ago Samsung began recommending KPE. We use KPE in new projects — it's faster and more reliable. For example, blocking an app via KPE:
val enterpriseDeviceManager = EnterpriseDeviceManager.getInstance(context) val applicationPolicy = enterpriseDeviceManager.applicationPolicy applicationPolicy.addPackageToBlacklist("com.example.gaming_app") applicationPolicy.addPackageToWhitelistForPermission( "com.company.app", Manifest.permission.CAMERA ) What's Included in Knox Integration?
- Obtaining and activating Knox licenses via Samsung Knox Reseller Portal
- Integrating Knox Vault for critical key storage
- Configuring KPE policies: Kiosk Mode, APN, Firewall, App Whitelist
- Per-app VPN via Knox VPN Framework (traffic tunneled before passing through Android networking stack)
- Knox Attestation for server-side device integrity verification
- Architecture documentation and administrator training
- Post-deployment support — 3 months
How Does Knox Attestation Protect Against Compromise?
Knox Attestation allows the server to verify that the device is not rooted and Knox status is intact. The client requests a nonce-based report:
val attestationManager = KnoxAttestationManager.getInstance(context) attestationManager.getAttestation(serverNonce) { report -> sendAttestationToServer(report) } The server validates the report via the Samsung Knox Attestation REST API — ensures boot chain is intact, knox_state = "ACTIVE", no signs of root or factory reset bypass. Samsung Knox Attestation API Reference This replaces legacy solutions like SafetyNet (deprecated) and requires fewer client-side checks. Verification time is about 200 ms on a 4G connection.
Comparison: Knox Vault vs. External HSM
| Parameter | Knox Vault | External HSM |
|---|---|---|
| Latency | 50 ms (with StrongBox) | 10–50 ms (over network) |
| Cost | Built into device | $500–2,000 per device |
| Management | Android Keystore API | Custom SDK |
| Physical isolation | Yes (separate processor) | Yes (enclosure) |
Knox Vault is justified for scenarios where keys are used locally and do not require real-time server validation. An external HSM is better for centralized key management.
Workflow
- Analysis — discuss requirements, determine necessary Knox APIs.
- Design — security architecture, licensing scheme.
- Implementation — integrate Vault, KPE, VPN, Attestation.
- Testing — on Knox-certified devices (Samsung Galaxy S21+, Tab series). 85% automated test coverage.
- Deployment — via Knox Mobile Enrollment with automatic license activation.
Timeframes: basic Knox Keystore integration — 2–3 weeks. Full project with KPE policies, VPN, Attestation — 6–10 weeks. Cost is calculated individually. Get an accurate estimate — contact us.
Common Integration Mistakes
- Forgetting to handle StrongBoxUnavailableException — the app crashes on devices without StrongBox (up to 15% of users).
- Not checking the Knox license status before calling SDK — results in SecurityException.
- Confusing Knox SDK with KPE: using deprecated APIs that won't be supported on new devices.
We account for these nuances in every project. Send us your scenario description — get a consultation.