Quantum computing is not a future problem. Governments have already signed enforceable mandates — NIST FIPS 203/204/205, NSA CNSA 2.0, EU DORA, NIS2 — with hard deadlines. Nation-state adversaries are already harvesting your encrypted traffic today, waiting for the day they can decrypt it. That day has a name: Q-Day.

This course gives security professionals the technical foundation and practical frameworks they need to understand, quantify, and act on the quantum threat — with zero physics or mathematics background required.

You will learn exactly how Shor's algorithm breaks RSA, ECDH, DSA, and every elliptic curve scheme in use today. You will learn why no key size increase protects you. You will learn how Grover's algorithm weakens AES-128 and SHA-256, and what the safe alternatives are right now.

You will master Mosca's Theorem — the risk framework used by CISOs and government agencies worldwide — and apply it to your own organisation to produce a scored, prioritised migration plan.

You will understand Harvest Now, Decrypt Later (HNDL): why data encrypted today under classical cryptography may already be sitting in an adversary's archive, and why this creates present-day compliance liability under GDPR Article 32, DORA, and NIS2.

You will map every vulnerable algorithm — TLS 1.3, IPsec, SSH, PKI, code signing, DNSSEC, S/MIME — to its quantum threat level, and understand exactly what breaks and what survives.

The course includes 7 supplementary papers in LaTeX for students who want the formal mathematics, 7 downloadable reference guides, section quizzes, and a capstone assessment with certificate of completion.

No prior quantum knowledge needed. If you manage, architect, or secure systems that rely on cryptography — this course is your mandate briefing.