(?In the process of writing this book, I followed the energy and guidelines of ISO/IEC17799, the world standard for information security management, to the risk management of information security, information security strategy, information security education, information security arrangement management, and information security management. The commonly used security technologies are introduced in detail. Information security is not a simple technical issue, information security focuses on management. Therefore, in addition to being applicable to computer system administrators, network administrators and information engineering system integration engineers, this book is also applicable to all users of relevant supervisory leadership and computer network system resources.)