The quantum threat is no longer theoretical-it is an engineering problem. Governments, defense agencies, cloud providers, and critical infrastructure organizations around the world are preparing for the largest cryptographic transition in the history of modern computing. Traditional public-key cryptography, including RSA and Elliptic Curve Cryptography, will eventually be vulnerable to cryptographically relevant quantum computers. The question is no longer if organizations must migrate-but how. Quantum-Safe Security: A Practitioner's Guide provides engineers, security architects, and technical leaders with a practical roadmap for understanding and implementing quantum-safe technologies. Inside you'll learn: ¿ Why quantum computing threatens today's encryption ¿ How Post-Quantum Cryptography (PQC) works and where it should be deployed ¿ How Quantum Key Distribution (QKD) uses the laws of physics to secure communications ¿ When hybrid PQC + QKD architectures provide the greatest protection ¿ How government mandates, NIST standards, and CNSA 2.0 affect migration planning ¿ Practical implementation guidance, performance considerations, and real-world deployment strategies Written from an engineer's perspective-not a research laboratory-this guide bridges the gap between theory and implementation, helping readers understand not only what is changing, but what they need to do next. Whether you design secure systems, support.