Cryptographic Testing and Validation Questions

Testing and validating cryptographic implementations to ensure correctness, interoperability, and security. Candidates should know how to construct unit tests, known answer tests using established test vectors, property based testing, integration tests, and automated test harnesses for cryptographic libraries. Understand industry validation processes and reference test suites from standards organizations such as the National Institute of Standards and Technology and how to apply their test vectors. Be able to verify implementations against reference implementations and specifications, design negative and boundary tests, and use fuzzing and corpus based testing to surface edge case failures. Be aware of security specific testing concerns including constant time behavior checks, side channel considerations, randomness and entropy validation, and the need for reproducible test artifacts and clear test reporting for cryptographic code.