Post-Quantum Security: Protecting Data for Decades

Some data must remain secure not for years, but for generations. Post-Quantum Security: Protecting Data for Decades addresses a future-facing threat that is already unfolding—the moment when quantum computers render today’s cryptography obsolete.
This book is about time, not panic. It explains why encrypted data captured today may be decrypted years later, and why long-term security planning must begin before large-scale quantum machines exist. Readers gain a clear understanding of how quantum algorithms threaten public-key cryptography and why migration cannot be delayed until the threat is visible.
Rather than focusing on fear, the book emphasizes preparation. It explores post-quantum cryptographic approaches, transition challenges, and the real-world complexity of upgrading global systems that were never designed to change easily.
Readers will gain insight into:
• Why “harvest now, decrypt later” is a real risk
• Which cryptographic systems are most vulnerable
• How post-quantum algorithms differ in structure and tradeoffs
• Why migration is harder than algorithm selection
• How organizations plan security across decades, not cycles
This book is for security leaders, architects, policymakers, and technologists responsible for long-term trust. If your concern is not the next breach but the next 30 years, this book forces the right conversation—before time runs out.