Pub 2015-4-1 100 Liaoning Science and Technology Press book is divided into eight chapters. Chapter 1 introduces the development of Internet and security technology. as well as research and the main contribution of this book. Chapter 2 presents a heavyweight of Web domain authentication and data sharing programs. The consistent hashing scheme between the annular space authentication server virtual node mapping based on the establishment of a relationship. allowing to minimize the cost to add or remove an authentication server. has strong load balancing and better redundancy . Chapter 3 presents a middleweight Web domain authentication and data sharing programs. The program to achieve cross-domain authentication. data transmission. Chapter 4 presents a lightweight Web-domain authentication and data sharing programs. The prog...