‘If you are intrigued by the prospects of quantum cryptography but not yet familiar with the formalism behind it, then this book is the perfect starting point for you. It playfully introduces the most important concepts in modern quantum cryptography, and at the same time gently but purposefully helps you discover the mathematical framework required to make formal statements.’ Marco Tomamichel, National University of Singapore ‘Vidick and Wehner cover quantum cryptography in its full beauty and depth. Packed with enlightening examples and comprehensive exercises, this book will likely become an indispensable companion next time I hold lectures on the subject.’ Renato Renner, ETH Zurich ‘Thomas Vidick and Stephanie Wehner take readers on an insightful exploration of the full landscape of quantum cryptography, skillfully weaving together theory and applications and providing pedagogical quizzes and exercises. The mathematical formalism is rigorous yet approachable, making this book an excellent introduction to this captivating area.’ Anne Broadbent, University of Ottawa

Preface; 1. Background material; 2. Quantum tools and a first protocol; 3. Quantum money; 4. The power of entanglement; 5. Quantifying information; 6. From imperfect information to (near) perfect security; 7. Distributing keys; 8. Quantum key distribution protocols; 9. Quantum cryptography using untrusted devices; 10. Quantum cryptography beyond key distribution; 11. Security from physical assumptions; 12. Further topics around encryption; 13. Delegated computation; References; Index.