Key Attestation Demo serves as a specialized diagnostic tool for Android security verification, specifically targeting developers and advanced users concerned with hardware-level security implementation. The application leverages Android's Key Attestation API to provide transparent insight into the integrity of a device's cryptographic key storage and Trusted Execution Environment (TEE) functionality, addressing critical security validation needs in enterprise and development environments. The core functionality revolves around generating and analyzing attestation certificates that verify whether cryptographic keys are protected by hardware-backed security features. The application examines multiple attestation security levels including software, trusted environment, and hardware-backed keymaster implementations. It provides detailed breakdowns of certificate chains, security levels, and verification results, enabling users to confirm whether their device meets Android's hardware security requirements. The open-source nature of the project allows technical users to audit the verification methodology and implementation details through its GitHub repository. User experience prioritizes technical clarity over aesthetic polish, presenting raw attestation data in structured, readable formats. The interface displays comprehensive certificate information including subject details, public key parameters, and security level indicators. Real-world usage typically involves developers validating device security before deploying sensitive applications or security researchers testing hardware security implementations across different Android devices and custom ROM configurations. User feedback consistently highlights the tool's effectiveness in identifying security implementation issues, particularly with modified Android installations. Multiple reviews from October 2022 by user Pietrina demonstrate how the application revealed TEE functionality breakdowns on custom ROM installations, with the reviewer noting 'Great tool, now I know 4 sure that TEE is completely broken on my device.' This pattern suggests the application successfully serves its intended diagnostic purpose for technical users. The application's primary strength lies in its precise execution of complex security verification processes, though its utility remains limited to highly technical audiences. The lack of simplified explanations or guided interpretations may hinder accessibility for non-developers, and the interface presents information in raw technical formats rather than user-friendly summaries. Ideal use cases include Android development teams verifying device security compliance, security researchers analyzing hardware protection implementations, and advanced users validating custom ROM security integrity.