constant-time-testing

You can detect timing side-channel leaks by auditing cryptographic implementations for secret-dependent branching and cache-timing. This skill applies formal verification, dynamic tracing, and statistical testing to identify microarchitectural leakage vulnerabilities.

Constant-time execution ensures code paths and memory accesses do not depend on secret data, preventing timing attacks. You need it when developing or auditing cryptographic primitives to guarantee attackers cannot infer secrets through execution time variations.

You use dudect for statistical testing and timecop for dynamic tracing to verify constant-time execution across architectures. This skill guides you through applying these tools to detect timing vulnerabilities and validate your cryptographic implementations.

To remediate timing vulnerabilities, you must eliminate secret-dependent branches and memory accesses in your cryptographic implementations. This skill provides actionable remediation guidance and verification steps to ensure constant-time guarantees across architectures and compiler optimizations.

Static analysis alone cannot detect all constant-time violations across compiler optimizations, as dynamic tracing is also required. This skill combines formal verification, statistical testing, and dynamic tracing to catch timing leaks that static analysis might miss.