Loki Intelligence — Security Briefs · Published
Hardware Hacking for Embedded Security
Connected devices trust more than firmware. Their real security boundary spans the boot chain, local storage, update path, development interfaces, device identity and connected services. Embedded Security is an active LOKI service for hardware that a customer owns or is explicitly authorized to have tested. We turn those trust assumptions into controlled checks, human-reviewed evidence, practical fixes and clear retest criteria.
By Sweder · Co-Founder · Product
Practical field guide
A practical embedded security test matrix
Use these boundaries to turn a hardware review into a scoped, repeatable engagement. The exact checks depend on the device, threat model and written authorization.
| Boundary | Question | Evidence | Target outcome |
|---|---|---|---|
| Boot trust | Can the device reject firmware that is not approved? | Boot configuration, signature verification and controlled negative tests | Only trusted bootloader and application images execute. |
| Stored code and data | What can physical access reveal or modify? | Flash configuration, readable regions and secrets handling | Sensitive code and data are protected against the agreed physical threat model. |
| Update path | Who can publish, deliver and authorize an update? | Signing, version checks, rollback controls and recovery behavior | Only authentic updates install, with a safe recovery path. |
| Debug access | Do development interfaces remain reachable in production? | JTAG, serial, USB and diagnostic configuration | Production interfaces are disabled or protected to match the threat model. |
| Device-to-cloud | Can one device exceed its intended identity or authority? | Credentials, API authorization, data flows and backend decisions | Device identity and permissions remain narrow, revocable and observable. |
Method step 01
The red screen is a signal, not the finding
The accompanying video is a controlled demonstration on hardware owned by LOKI. It does not show a customer system or an uncontrolled production-device compromise. The useful question is not what appears on the display, but which trust decision allowed the device to reach that state.
Why it matters: A dramatic result only becomes security evidence when it is tied to a reproducible path, a defined boundary and a practical change the product team can verify.
Method step 02
Map the full device trust chain
A connected device rarely stands alone. Firmware, boot configuration, flash storage, development interfaces, update infrastructure, backend APIs and cloud identities can all decide what the device is allowed to trust and do.
Why it matters: A strong control at one layer can be undermined by a weaker adjacent layer. The review has to follow realistic paths across the device lifecycle rather than treating a firmware image as an isolated file.
Method step 03
Verify boot and firmware authenticity
The assessment checks whether the device can distinguish approved firmware from an unauthorized image. Depending on scope, that can include the bootloader, application signatures, key handling, anti-rollback behavior and the transition from manufacturing to production configuration.
Why it matters: Secure boot is meaningful only when signing keys, configuration and update behavior preserve the chain of trust in the real production lifecycle.
Method step 04
Inspect storage and debug boundaries
Physical access changes the threat model. We can review flash-encryption configuration, sensitive data placement, secret handling and whether JTAG, serial, USB or diagnostic interfaces remain exposed beyond their intended development use.
Why it matters: Encryption and interface controls should protect the code, data and authority that matter without blocking legitimate manufacturing, support and recovery workflows.
Method step 05
Test signed updates, rollback and recovery
An update path is a privileged control plane. The scoped review can examine who may sign and publish firmware, how the device authenticates packages, which versions it accepts and what happens when an update fails or a recovery path is invoked.
Why it matters: A secure update design must reject unauthorized code while still giving the product team a deliberate, tested way to recover devices safely.
Method step 06
Follow the boundary from device to cloud
Connected hardware also depends on device identity, credentials, API authorization and backend decisions. The review can trace whether a device can impersonate another unit, exceed its intended role, retain access after revocation or expose data across customers or environments.
Why it matters: A protected firmware image does not compensate for overbroad cloud authority. Device and service controls have to enforce the same narrow trust model end to end.
Method step 07
Permission, evidence, fix and retest
Every LOKI Embedded Security engagement starts with ownership or explicit written authorization. Devices, firmware versions, connected services, exclusions, safe-test limits, timing, data handling and stop conditions are agreed before testing begins. A person reviews observations before release as findings.
Why it matters: The result is bounded, decision-ready evidence: confirmed behavior, practical remediation, retest criteria and a clear distinction between proven findings, blocked paths and untested assumptions.
Primary references
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