Cryptography in Chinese consists of two characters meaning secret coded . Thanks to Ch in Chiu-Shao and his successors the Chinese Remainder Theorem became a cornerstone of public key cryptography. Today as we observe the constant usage of high-speed computers interconnected via the Internet we realize that cryptography and its related applications have developed far beyond secret coding . China which is rapidly developing in all areas of technology is also writing a new page of history in cryptography. As more and more Chinese become recognized as leading researchers in a variety of topics in cryptography it is not surprising that many of them are Professor Xiao s former students. Progress on Cryptography: 25 Years of Cryptography in China is a compilation of papers presented at an international workshop in conjunction with the ChinaCrypt 2004. After 20 years the research interests of the group have extended to a variety of areas in cryptography. This edited volume includes 32 contributed chapters. The material will cover a range of topics from mathematical results of cryptography to practical applications. This book also includes a sample of research conducted by Professor Xiao s former and current students. Progress on Cryptography: 25 Years of Cryptography in China is designed for a professional audience composed of researchers and practitioners in industry. This book is also suitable as a secondary text for graduate-level students in computer science mathematics and engineering.