Cryptographic Failure Modes and Error Handling Questions

This topic evaluates understanding of how cryptographic systems fail and how to design safe error handling and recovery strategies. Areas covered include handling decryption and authentication failures without creating oracles, designing secure default behaviors and graceful degradation, telemetry and logging that avoid secret leakage, key compromise detection and automated rotation or revocation, rollback and backup handling, and the user experience implications of cryptographic failures. Interviewers will probe testing strategies for failure scenarios and incident response patterns that preserve security while maintaining availability.