Secure Enclave and Hardware Integration Questions

Understanding hardware backed isolated execution environments and how they integrate with system software to provide key protection and secure operations. Topics include secure enclave and secure element architecture, hardware isolation boundaries, key storage and wrapping, device attestation and provisioning, secure boot and firmware integrity, integration with operating system services and biometric sensors, trade offs between performance and tamper resistance, secure update and lifecycle management, and testing and validation approaches. Candidates should be able to describe threat models for hardware attacks, mitigation strategies for side channel and fault injection, and practical constraints when interfacing application code with hardware security capabilities.