This book offers an accessible and engaging introduction to quantum cryptography, assuming no prior knowledge in quantum computing. Essential background theory and mathematical techniques are introduced and applied in the analysis and design of quantum cryptographic protocols. The title explores several important applications such as quantum key distribution, quantum money, and delegated quantum computation, while also serving as a self-contained introduction to the field of quantum computing. With frequent illustrations and simple examples relevant to quantum cryptography, this title focuses on building intuition and challenges readers to understand the basis of cryptographic security. Frequent worked examples and mid-chapter exercises allow readers to extend their understanding, and in-text quizzes, end-of-chapter homework problems, and recommended further reading reinforce and broaden understanding. Online resources available to instructors include interactive computational problems in Julia, videos, lecture slides, and a fully worked solutions manual.

'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
'[An] exciting, clearly written and self-contained textbook … It is an ideal way for those interested in quantum cryptography to enter the field with no prior knowledge and emerge with the understanding and the tools to progress.' Barry R. Masters, Optica

Thomas Vidick is Professor in the Department Computer Science and Applied Mathematics at the Weizmann Institute of Science in Israel. He received his Ph.D. from UC Berkeley in 2011, followed by two years of postdoctoral research at the Massachusetts Institute of Technology, where he worked on quantum complexity and cryptography. He joined the Computer Science Faculty at the California Institute of Technology in 2014, and became Professor in 2018. In 2022 he took a leave from CalTech to start his current position at the Weizmann Institute. Professor Vidick is best known for his research on device-independence, including the first security proof of device-independent quantum key distribution. In 2019 he received a Presidential Early-Career Award, and in 2021 was named a Simons Investigator at CalTech. In 2023 he received the Michael and Sheila Held prize from the National Academy of Sciences for his work in quantum cryptography and quantum complexity. Stephanie Wehner is Antoni van Leeuwenhoek Professor at Delft University of Technology, QuTech, and Director of the Quantum Internet Alliance. A member of the Royal Netherlands Academy of Arts and Sciences, she is also a co- founder of QCRYPT, the largest international conference in quantum cryptography. In a former life, she worked as a professional hacker. Her research is focused on manipulating the laws of quantum mechanics to construct better information networks and computer systems. Together with the Quantum Internet Alliance she is working on realizing a large-scale quantum computer network.