Hardware Security Measures

On many embedded boards, cryptographic keys travel in plain text. Across buses. Between chips. This physical layer is often ignored in security discussions. Sometimes that is acceptable. Sometimes it is a serious exposure that no one noticed. The gap usually comes from a few concrete issues: 1. The attacker model is too abstract Many teams think only about remote attackers on the other side of the Internet. In practice, malicious physical access happens. Returned devices, field units everyone can access to, repair labs, competitors that buy your stuff to reverse-engineer. Dumping firmware or probing buses is not exotic (there are tutorials online). 2. Assets are not clearly defined What are you actually protecting? - is it the firmware (confidential code, reverse engineering risk)? - is it about baked-in credentials (API keys, cryptographic keys shared between device series)? - proprietary algorithms or data If this is not explicit and shared with the whole team, design decisions become arbitrary. Sometimes ones that are unrelated at the first sight. 3. Hardware security features are underused Modern SoCs provide useful primitives: - secure key storage (with OTP, fuses, secure elements) - memory encryption (keys handled inside the controller) - isolation features (TrustZone, enclaves) These are not theoretical. They are available and often just not enabled. 4. Low level analysis feels harder than it is Yes, bus analysis requires some protocol knowledge. But tools can do much on their own. A basic logic analyzer can decode SPI, I2C, UART out of the box. You can quickly see if you can see sensitive data on the bus. 5. Physical attacks are seen as "too expensive to care" High-end and expensive protections exist for specific product types. It doesn't mean you need them to for your device. Simple measures already reduce risk significantly: - keep keys inside a single chip when possible - avoid sending secrets over external buses - enable available hardware protections In embedded systems, the boundary is the device, not (or not only) the network. If keys leave the chip in clear text, you should assume someone can see them. Have you ever checked what actually goes over your board buses during boot or update? Only then you can decide if it is a problem or not.

Understanding Cybersecurity in Embedded Systems series: Part 6- HSM What is the most important thing in securing software? It’s not the algorithm. It’s the KEYS. You can use AES, RSA, ECC or any strong algorithm, but if the keys are stolen, the entire security collapses. Once an attacker has the key, they can decrypt data, create fake firmware, and completely bypass all protection. So the real question is: What if there was a place to store these keys where it is almost impossible to read or tamper with them? That is where the Hardware Security Module, or HSM, comes in. An HSM is a secure hardware block inside the chip that is specifically designed to protect cryptographic keys. The keys stored inside an HSM are not accessible to normal software. Even if someone gains full control of the CPU, the keys cannot be read out. Instead of giving the key to the software, the HSM keeps the key to itself. When the system needs to encrypt data, decrypt data, or verify a signature, it asks the HSM to do the operation. The HSM performs the cryptographic operation internally and only returns the result, never the key. You might ask, how is this different from storing keys in OTP or eFuses? OTP or eFuses are mainly used to store values that should never change, like configuration bits or public keys. They are permanent and simple, but they do not actively protect the key during cryptographic operations. Once the CPU reads a key from OTP or eFuse, the key is exposed in software and memory. An HSM is different. The key never leaves the secure hardware. It cannot be dumped through debug interfaces, memory reads, or software attacks. The HSM also adds protections like access control, secure key lifecycle, and sometimes protection against physical attacks. That’s why modern secure systems rely on HSMs. -Algorithms provide strength, but keys provide trust. -And HSMs are what keep those keys safe. What an HSM does in simple terms • Stores cryptographic keys in a secure area that normal CPU code cannot read • Performs cryptographic operations internally • Never exposes the secret keys outside the HSM • Protects against software and some physical attacks (This brings me to the end of this cybersecurity series. I hope these posts were easy to understand and helped beginners get a clearer picture of embedded cybersecurity concepts like secure boot, digital signatures, root of trust, cryptography, and HSMs. If even a few of these posts helped you understand how cybersecurity really works inside embedded systems, then the series did its job. Thanks for reading 🙂, Happy Learning! )

What protects the protector? In modern embedded systems, software alone is insufficient. True trust begins where secrets are securely stored, managed, and executed — inside the Hardware Security Module (HSM). I recently explored the full ecosystem of HSM Keys, covering topics such as root keys, secure boot, OTA signing, AUTOSAR crypto stacks, device identity, post-quantum readiness, and zero-trust architectures. As vehicles, industrial devices, and IoT systems become increasingly connected, cybersecurity is essential. Every ECU, controller, and smart node now relies on secure key lifecycles, tamper resistance, authenticated updates, and resilient trust chains. For Automotive Engineers: Think beyond CAN/LIN/Ethernet signals. Security now accompanies every packet, firmware image, and diagnostic session. For Industrial & IoT Leaders: The next reliability challenge extends beyond uptime — it is digital trust. Key areas covered in this presentation include: - Root of Trust & Secure Boot - HSM Key Types (AES, ECC, KEK, Session, Identity) - Provisioning & Manufacturing Security - AUTOSAR Crypto Stack (Csm / CryIf / KeyM) - OTA Security & Anti-Rollback - SHE vs HSM vs TPM vs Secure Elements - Future Trends: PQC, AI Anomaly Detection, Remote Attestation In the software-defined era, the strongest systems are built on invisible foundations of trust. #CyberSecurity #EmbeddedSystems #AutomotiveEngineering #HSM #AUTOSAR #SecureBoot #OTA #IoT #ECU #FunctionalSafety #ConnectedVehicles #SoftwareDefinedVehicle #EngineeringLeadership #DigitalTrust

I mentioned a few weeks back how cybersecurity is an area that e27 (Optimatic) is focusing on quite a bit for Q1 in 2025. Here's a post about an interesting cybersecurity startup focusing on security at the hardware level. Software can't protect you from software. That's the uncomfortable truth Camellia Chan and May Chng, CoFounders of FLEXXON, are betting the industry will finally confront. Most cybersecurity conversations start and end in the same place: another layer of software. Another dashboard. Another alert, usually arriving after the damage is already done. Singapore's Flexxon is making a quieter, but arguably more disruptive argument: what if the real vulnerability isn't in your apps or your network, but in the assumption that software can defend itself against software? It's not a theoretical concern. Zero Day attacks, threats no one has seen before, consistently outpace signature-based detection. And here's the part that deserves more attention: malware is software. Which means, at a fundamental level, software-based defences can be manipulated by software-based attacks. Flexxon's answer sits at the hardware layer. Their X-PHY platform embeds an AI co-processor directly into storage devices, monitoring data access patterns in real time at the silicon level, a place malware simply can't reach. Think of it less as a replacement for your existing security stack and more as the foundation your stack should have been built on. Three capabilities stand out. AI-embedded threat detection that runs autonomously on the chip itself. Pre-boot security that kicks in before the OS even loads, closing a window software tools can't touch. And morphology-based analysis that reads the behaviour of an attack, not just its signature, making it effective against threats that have never been seen before. The implications for Southeast Asia are significant. The region is scaling edge computing and IoT infrastructure fast, devices that are remote, constrained, and sometimes offline. That's exactly where cloud-dependent security breaks down. Hardware-level protection that works locally, autonomously, without a constant network connection isn't a nice-to-have in that context. It's a necessity. There's a regulatory dimension too. Data sovereignty rules in markets like Indonesia and Vietnam are tightening. Hardware-enforced protection that keeps data on-premises with tamper-resistant audit logs isn't just a security feature — it's becoming a compliance requirement. The real question Flexxon is forcing isn't "should we add hardware security?" It's "why didn't we start here?" The mindset shift will be harder than the engineering. But in a region digitising at speed, with breach costs climbing and attack sophistication accelerating, the window for treating hardware-layer security as optional is closing fast. Worth watching closely. https://lnkd.in/gqMa-AtW

This week’s reporting on the alleged Everest ransomware breach of ASRock Rack should be a wake-up call for anyone relying on modern server, storage, and cloud hardware. When an enterprise vendor’s internal repositories of firmware, BIOS, BMC code, diagnostic tools, and drivers are exposed, supply chain integrity is in jeopardy.  Adversaries gain insight into board layouts, update mechanisms, and secure boot flows, which accelerates vulnerability discovery and makes it easier to craft implants that look “authentic”. Implants come in many shapes and forms,s including repackaged drivers, UEFI images, and recovery media. In the worst case, compromise at this level undermines the hardware root of trust itself: if attackers can subvert firmware signing, update channels, or UEFI components, they can persist below the operating system, survive reimaging, and silently bypass many controls. Incidents like this underscore that supply-chain attacks targeting firmware and UEFI are now strategic targets, not edge cases. Defenders need to assume that detailed knowledge of platform internals is in adversary hands and respond by monitoring below the OS as a first-class requirement.  Measuring firmware integrity at boot, continuously attesting critical components (UEFI, BMC, NICs, RAID controllers), and watching out-of-band management paths for anomalous behavior is important. The trust model for infrastructure is shifting, and security programs that do not include firmware and UEFI telemetry are already behind the curve. Article: https://lnkd.in/ePkSqvkM

🚗🔐 HSM in Renesas Automotive Microcontrollers – Backbone of ECU Security In modern cars, ECUs are exposed to remote updates, connectivity and complex networks, which makes hardware-based security essential. That’s where the HSM (Hardware Security Module) inside a Renesas microcontroller comes in. 🔒 What is an HSM? An HSM is a dedicated, isolated security core inside the MCU. It runs its own firmware and protects secrets and security operations, independent from the application CPU. 🧩 Key Capabilities of HSM in Renesas MCUs Secure key storage – Keys stored in hardware-protected memory, not visible to normal software Crypto acceleration – Hardware engines for AES, SHA, MAC, ECC/RSA to speed up security operations Secure boot – Verifies the integrity & authenticity of the application before it runs Secure flashing / OTA – Ensures only trusted software images are programmed into the ECU Secure on-board communication – Used with AUTOSAR SecOC to add MAC/signatures to CAN / FlexRay / Ethernet frames Random number generation – True/DRBG sources for key and nonce generation Tamper protection – Configurable security states, debug lock, and access control to prevent code & data extraction 🚘 Why it’s critical in automotive ECUs Protects ADAS, gateway, powertrain and connectivity ECUs from spoofing, cloning and manipulation Helps meet ISO/SAE 21434 and UNECE R155/R156 cyber-security requirements Offloads heavy crypto from the main core → more CPU time for control & application logic Forms the root of trust for secure bootloader, secure diagnostics, and OTA updates For engineers working on AUTOSAR, bootloaders, gateways, secure comms or OTA, understanding how to configure and use the HSM on Renesas microcontrollers is now a must-have skill in automotive cybersecurity. #AutomotiveCyberSecurity #HSM #Renesas #Microcontroller #Autosar #SecureBoot #SecOC #OTA #EmbeddedSystems #AutomotiveECU

Most conversations about cybersecurity begin with software. Firewalls. Monitoring platforms. Threat detection systems. But long before any of those layers operate, something more fundamental must exist: Trust in the machine itself. At the foundation of that trust is often a component small enough to sit in the palm of your hand , the Trusted Platform Module (TPM). This hardware root of trust protects cryptographic keys, verifies system integrity, and ensures that a device starts from a known trusted state. Before the dashboards. Before the alerts. Before the machine learning models. Security begins at the hardware layer. Interestingly, my own journey into cybersecurity started on the hardware side of technology. That perspective continues to shape how I approach security architecture today. Because real cybersecurity architecture is never just about protecting applications. It’s about protecting the entire foundation the system is built on. Hardware. Identity. Data. Operations. The strongest security architectures are not built only on controls. They are built on trust embedded into the system itself. And sometimes the most important security components are also the smallest. #CyberSecurity #CyberSecurityArchitecture #HardwareSecurity #TrustedComputing #TPM

🛡️ Beyond MFA: Defeating "Starkiller" and the Rise of Proxy-Phishing If you still view phishing as "static fake pages," your defense strategy is outdated. A new Phishing-as-a-Service (PaaS) called "Starkiller" is commoditizing Advanced Persistent Threat (APT) techniques for the masses. By using headless browsers and Docker containers to act as a Reverse Proxy, Starkiller doesn't just steal passwords—it hijacks the entire authenticated session in real-time. https://lnkd.in/eJ9BnK5w ⚔️ The Offensive Tactic: Real-Time Relay: >> The "Link Trick": Uses the @ symbol in URLs (e.g., login.microsoft.com@malicious.site) to trick users and bypass simple domain filters. >> Live Interception: It loads the real brand site in a headless Chrome instance. Every keystroke and MFA code is forwarded instantly. >> Session Theft: Once the victim completes MFA, the attacker captures the session cookies/tokens, gaining full account access without ever needing the password again. 🛡️ Defensive Controls: Moving to Phish-Resistant Architecture: >> Standard MFA (SMS, Push, TOTP) is no longer a "silver bullet" against proxy attacks like this. We must move up the stack: 1. Implement Phish-Resistant MFA: >> Shift toward FIDO2/WebAuthn (Passkeys) or hardware security keys (YubiKeys). These bind the authentication to the specific origin URL, making it impossible for a proxy to replay the credential. #HardwareSecurityModules 2. Network & Browser-Level Detection: >> AIP/Conditional Access: Enforce "Managed Device" requirements so that even a valid stolen session token cannot be used from an untrusted, unmanaged attacker IP. #ConditionalAccessPolicies >> URL Sandboxing: Deploy advanced email security that identifies the "URL Masking" pattern (user@domain) and inspects the final destination, not just the visible link. #EmailSecurityControls 3. Session Monitoring & Revocation: >> Treat session tokens as high-value targets. Shorten session lifespans and implement Continuous Access Evaluation (CAE) to revoke tokens immediately if a user's location or risk profile changes. #CAE 4. User Behavioral Coaching: >> Standard "don't click links" training isn't enough when the landing page is the actual Microsoft or Google site. Users must be trained to inspect the top-level domain in the address bar, regardless of how the page looks or behaves. #HumanCenteredAwareness The Bottom Line: Starkiller proves that cybercrime has reached enterprise-level maturity. We can't secure a 2026 threat landscape with 2016 defenses. #CyberSecurity #Infosec #MFA #ZeroTrust #Starkiller #Phishing #CISO #CloudSecurity

𝗗𝗮𝘆 𝟮𝟲 𝗼𝗳 𝗠𝘆 𝗜𝗦𝗢 𝗜𝗺𝗽𝗹𝗲𝗺𝗲𝗻𝘁𝗮𝘁𝗶𝗼𝗻 𝗦𝗲𝗿𝗶𝗲𝘀: 𝗣𝗵𝘆𝘀𝗶𝗰𝗮𝗹 𝗦𝗲𝗰𝘂𝗿𝗶𝘁𝘆 𝗖𝗼𝗻𝘁𝗿𝗼𝗹𝘀 (𝗔𝟳): 𝗔𝟳.𝟰, 𝗔𝟳.𝟱, & 𝗔𝟳.𝟲 (𝗣𝗼𝘀𝘁 𝟮 𝗼𝗳 𝟯) Continuing our exploration of ISO 27001 Annex A controls, today we delve into essential Security Controls which are A7.4, A7.5, and A7.6. These controls are crucial for protecting our information and infrastructure from physical threats. 𝟳.𝟰 𝗣𝗵𝘆𝘀𝗶𝗰𝗮𝗹 𝗦𝗲𝗰𝘂𝗿𝗶𝘁𝘆 𝗠𝗼𝗻𝗶𝘁𝗼𝗿𝗶𝗻𝗴 Control Objective: Premises must be continuously monitored to detect unauthorized physical access. Key Message: Implementing robust monitoring systems, such as CCTV and access logs, is vital for identifying potential breaches and ensuring a secure environment. 𝟳.𝟱 𝗣𝗿𝗼𝘁𝗲𝗰𝘁𝗶𝗻𝗴 𝗔𝗴𝗮𝗶𝗻𝘀𝘁 𝗣𝗵𝘆𝘀𝗶𝗰𝗮𝗹 𝗮𝗻𝗱 𝗘𝗻𝘃𝗶𝗿𝗼𝗻𝗺𝗲𝗻𝘁𝗮𝗹 𝗧𝗵𝗿𝗲𝗮𝘁𝘀 Control Objective: Organizations must design and implement protections against physical threats, including natural disasters and intentional or unintentional damage to infrastructure. Key Message: Proactive measures to safeguard against environmental threats are essential for maintaining operational integrity and resilience. 𝟳.𝟲 𝗪𝗼𝗿𝗸𝗶𝗻𝗴 𝗶𝗻 𝗦𝗲𝗰𝘂𝗿𝗲 𝗔𝗿𝗲𝗮𝘀 Control Objective: Security measures for working in secure areas must be effectively designed and implemented to prevent unauthorized access. Key Message: Establishing clear protocols for secure areas ensures that sensitive information remains protected at all times. 𝗜𝗺𝗽𝗹𝗲𝗺𝗲𝗻𝘁𝗮𝘁𝗶𝗼𝗻 𝗧𝗶𝗽𝘀: 1. Develop a comprehensive physical security policy that outlines monitoring practices and response strategies. 2. Train security personnel to effectively monitor access points and respond to incidents. 3. Utilize advanced surveillance technologies to enhance monitoring capabilities. 4. Conduct regular risk assessments to identify potential environmental threats and vulnerabilities. 5. Establish clear access protocols for secure areas, ensuring only authorized personnel can enter. 𝗖𝗼𝗻𝗰𝗹𝘂𝘀𝗶𝗼𝗻 Implementing these #physicalsecurity controls is vital for safeguarding organizational assets against a range of threats. By enhancing monitoring practices, protecting against environmental risks, and securing sensitive areas, we can create a safer operational environment for everyone involved. Let’s prioritize these measures as part of our overall #informationsecurity strategy. #ImplementISO27001In30Days #Cybersecurity #RiskManagement #ContinuousImprovement

Understanding the Role of HSM in Payment Transactions In modern payment systems, security is a critical component. One of the most important devices used to protect sensitive financial data is the Hardware Security Module (HSM). When a transaction is initiated from an ATM or POS, the system sends a message formatted using the ISO 8583 standard. This message contains multiple fields such as transaction amount, card number, processing code, and security data. However, the HSM does not process the entire message. Instead, the payment switch parses the message and extracts specific security-related fields that require cryptographic operations. Typical examples include: • PIN Block verification (DE52) • MAC generation or validation (DE64 / DE128) • CVV / PVV generation • Cryptographic key management 🔎 Simplified Transaction Flow: 1️⃣ ATM / POS sends an ISO 8583 transaction message 2️⃣ The payment switch parses the message 3️⃣ Security-related fields are sent to the HSM 4️⃣ The HSM performs secure cryptographic operations 5️⃣ The result is returned to the switch to complete the transaction HSM devices play a crucial role in ensuring that PIN data, cryptographic keys, and transaction authentication remain protected within payment ecosystems. #Payments #HSM #CyberSecurity #ISO8583 #Fintech #BankingT