Most books in cryptography deal with theory, generally introducing mathematically expressed algorithms without taking into account new research or showing how they are realised in actual software and hardware technology. This book, on the other hand, introduces new current cryptographic systems while giving practical details and implementations in order to ensure the dissemination of new knowledge and the transfer of this research into the field of applied engineering. This book focuses on new data encryption designs and data protection schemes from academic research results and their practical implementation in several application fields. It covers the theory and practice of the research of robust encryption, including chaotic encryption and decryption systems, chaotic synchronisation encrypter/decrypter, data confidentiality protection and integrity, data authentication, key generation, hyperchaotic or chaotic random number generators and hardware/software realisations. This book also addresses the digital media (audio, image, and video) protection and the encryption- compression technique. "Progress in Data Encryption Research" is a comprehensive text that is suitable as a handbook for understanding the novelty of data encryption and security, as well as for hardware and software engineers who are interested in building new secure systems. Researchers who want to know the trend of developing new practical data encryption and data protection schemes, engineers from the industry and students can use this book as a first step to encryption engineering.