PQC Checker Post-Quantum Supp

PQC Checker is a lightweight security extension that helps you understand whether a website is prepared for the post-quantum cryptography (PQC) era.

As quantum computing advances, traditional public-key cryptography may become vulnerable. PQC Checker provides a quick, transparent overview of the cryptographic properties used in the TLS connection of the currently open website.

🔍 What PQC Checker checks

🔐 TLS version used by the website

🔑 Key exchange mechanism reported by the browser

🧬 Detection of post-quantum or hybrid key exchange algorithms (such as classical + PQC combinations)

⚠️ Identification of classical-only cryptography with no PQC indicators

🧪 Clear labeling of unknown or experimental configurations

🧠 How it works

PQC Checker uses TLS security metadata exposed by the browser to analyze the connection of the active tab. It does not intercept traffic, decrypt data, or access private keys.

All detection is heuristic and informational, based on algorithm names and indicators reported by the browser and supported by the current Firefox version.

🛡️ Privacy & transparency

✅ All analysis runs locally in your browser

✅ No data collection

✅ No tracking

✅ No external servers or APIs

✅ No browsing history or connection data is stored or transmitted

Only the TLS information of the currently active page is inspected when the extension is opened.

🎓 Intended use

PQC Checker is designed for:

Developers and security engineers

Researchers and students exploring post-quantum security

Educators demonstrating modern cryptography concepts

Security-aware users who want visibility into future-proof encryption

Results are informational only and depend on browser support and platform capabilities. They do not guarantee full post-quantum security of a website.

PQC Checker helps bridge the gap between today’s web security and tomorrow’s cryptographic challenges—clearly, locally, and without compromising privacy.