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constant-time-testing

Detect and quantify timing side channels in cryptographic code using dudect and Timecop.

9|4|Updated Feb 7, 2026
Search Tags:#cryptography#statistical-analysis#dynamic-analysis#dudect#constant-time#timing-attacks#timecop
One-click install
npx skills add https://github.com/marduk191/qwen3_mcp --skill constant-time-testing-marduk191
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: constant-time-testing
Source: https://github.com/marduk191/qwen3_mcp/tree/main/skills/testing-handbook-skills/skills/constant-time-testing
Command: npx skills add https://github.com/marduk191/qwen3_mcp --skill constant-time-testing-marduk191

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

Timing attacks exploit variations in execution time to extract secret information from cryptographic implementations. This skill provides a structured approach to detect, analyze, and remediate timing leaks.

Core Features & Use Cases

  • Static and dynamic analysis to identify secret-dependent timing paths in crypto code.
  • Statistical detection with frameworks like dudect to quantify leakage.
  • Dynamic tracing with Timecop to pinpoint exact leak locations and data flow.
  • Guidance for integration into CI and remediation workflows for robust crypto software.

Quick Start

Run a quick constant-time analysis on your cryptographic function using a dudect harness to detect timing leaks.

Frequently Asked Questions about constant-time-testing

High-intent search queries and answers about installing and using this skill.

FAQPage Schema
How do I detect timing side channels in cryptographic code?▼

You detect timing side channels in cryptographic code by measuring how execution time varies with secret data, using statistical frameworks like dudect and dynamic tracing with Timecop to pinpoint exact leak locations.

What is constant-time testing and when do I need it for crypto primitives?▼

Constant-time testing identifies secret-dependent timing paths in cryptographic implementations. You need it during development, code reviews, and CI pipelines to prevent timing attacks on RSA, ECC, and post-quantum algorithms.

How do I set up a dudect harness to find timing leaks fast?▼

You set up a dudect harness to run constant-time analysis on your cryptographic function, which statistically quantifies leakage by comparing execution times across different secret data inputs.

Can I integrate constant-time analysis into a CI pipeline?▼

Yes, you can integrate constant-time analysis into CI pipelines and remediation workflows. The approach provides structured detection and remediation guidance to ensure robust crypto software validation.

Does constant-time testing work with post-quantum cryptographic algorithms?▼

Yes, constant-time testing applies to auditing crypto implementations across RSA, ECC, and post-quantum algorithms. It requires an environment to run tests on representative architectures for accurate leakage detection.

What's the difference between dynamic analysis with Timecop and statistical detection with dudect?▼

dudect provides statistical detection to quantify overall timing leakage, while Timecop performs dynamic tracing to pinpoint exact leak locations and trace data flow within the cryptographic code.

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