Quantum computing is no longer a distant research topic. It is a strategic security threat that is already reshaping the confidentiality, integrity and longevity of today's data. The risk of harvest now, decrypt later attacks means that information being stolen today may be decrypted years from now, long after traditional security controls have failed. For organisations with long data lifecycles, this threat is real, growing, and irreversible.
Quantum Security bridges the critical gap between academic quantum research and real-world cybersecurity practice. Drawing on extensive PhD research and more than two decades of senior cybersecurity leadership, Jeremy Green presents a practical, structured approach to preparing organisations for the quantum era — without speculation, hype, or unrealistic timelines.
At the core of the book are two original, practitioner-focused frameworks:
Q-SLICE? — a quantum-native threat modelling framework designed to identify security failure modes that classical threat models cannot express.
QUANTA? — a modular governance and control framework for implementing crypto-agile, quantum-resilient security, aligned with NIST CSF, ISO/IEC 27001, CIS Critical Security Controls v8, and CMMC.
What you will learn
Inside this book, you will discover:
- A clear, accessible explanation of quantum computing concepts specifically relevant to security leaders and architects.
- Why classical risk models fail in the face of quantum uncertainty and irreversible cryptographic compromise.
- How post-quantum cryptography works, what NIST standardisation really means, and how to plan migration without disrupting operations.
- How to apply Q-SLICE? to identify quantum-specific threats across cryptography, infrastructure, governance, and supply chains.
- How to implement QUANTA? to govern quantum risk using condition-based security and crypto-agile controls.
- Real-world scenarios, including satellite and long-lived data environments under quantum threat.
- Practical guidance for quantum-aware incident response, aligned with NIST SP 800-61.
- Advanced tools and concepts including the Q-SLICE Threat Harness, CIA-3D, and cryptographically relevant quantum computer (CRQC) readiness assessment.
Who this book is for
This book is written for security architects, CISOs, risk professionals, policymakers, and technology leaders who need to make defensible decisions about quantum risk before the threat becomes unavoidable.
Rather than offering predictions about "Q-Day", Quantum Security equips readers with the frameworks, governance models, and practical controls required to act under uncertainty. ensuring long-term resilience in a post-quantum world.
