Semiconductor Defects in Hardware Logic with Security-Sensitive Implications

Semiconductor defects are physical imperfections in a chip that can arise from manufacturing errors, material aging, or operation under extreme stress. Common causes include failures in the packaging, wire bonds, metal layers (like corrosion or electromigration), or the silicon oxide layer itself. These defects typically force specific internal signals, inputs, or outputs to become permanently stuck at a logical high (1) or low (0) state, preventing them from switching correctly. When these stuck-at faults occur within a hardware module responsible for security functions—such as encryption, secure boot, or key storage—the module can no longer operate as designed. This failure can directly compromise the device's security objectives, allowing for bypasses, data leakage, or a complete loss of security guarantees. Understanding these failure modes is crucial for designing robust hardware with appropriate safeguards and testing.