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What is it? Secure Boot is a mechanism that verifies the authenticity and integrity of software code stored in flash memory before allowing the system to execute it. The MCU will only boot the application if the code has not been tampered with. Why is it needed? Prevents unauthorized firmware execution. Protects against malicious code injection during the boot process. Blocks attempts to bypass security checks by tampering with the bootloader. Ensures the ECU does not boot into a compromised or corrupted state. 🔍 For example, an attacker might modify the bootloader to disable security features after boot. Secure Boot prevents this by enforcing integrity checks from the very first instruction. Types of Secure Boot: Symmetric-Based Secure Boot Uses shared keys for both signing and verification. Easier to implement, but key management is critical. Asymmetric-Based Secure Boot Uses a private-public key pair. The bootloader verifies the signature of the firmware using a public key, while t...

 With increasing connectivity and functionality in modern vehicles and IoT devices, security has become a non-negotiable aspect of embedded system design. Automotive ECUs and IoT MCUs are now exposed to threats that can compromise safety, privacy, and system integrity. To mitigate these risks, a suite of fundamental secure features is implemented across the lifecycle of embedded software. This blog outlines six core security pillars that serve as the foundation for robust ECU security: Fundamental Secure Feature I: Secure Boot Fundamental Secure Feature II: Secure Flash Fundamental Secure Feature III: Secure JTAG Fundamental Secure Feature IV: Secure LOG Fundamental Secure Feature V: Secure UDS Fundamental Secure Feature VI: Secure On-Board Communication (SecOC) These six foundational security features—Secure Boot, Secure Flash, Secure JTAG, Secure Log, Secure UDS, and Secure On-Board Communication (SecOC)—are critical for building a trustworthy embedded system. Whether in automoti...

Cyber Security Interview Question and Answer Digital Signature Why signature is calculated for the Hash, not directly for the Sw code? Achieve C interview Topic

  In Modern automotive system, security during the Booting process of electronic Control using (ECU's) is more critical than ever. One cornerstone of this security is Authenticated Boot , which ensures that only trusted and verified firmware is executed. This protects the system from unauthorized or malicious modification.  Depending on the system architecture and performance needs, Authenticated Boot can be implemented serval ways. Below we explore four key strategies. Sequential Boot, Concurrent Boot, Contingent Boot and Delayed Boot.  Sequential Boot  Depending Sequential Authenticated Boot is method where each's software component in the boot chain is verified one after other, in a strict sequence. The process ensures that only after the  entire chain of trust has been validated does the system hand over control to the main firmware for normal execution.  characteristics: Authentication is performed in strict linear order .  Execution begins only a...