When writing my first scripting book, Managing Windows with VBScript and WMI (Addison Wesley, 2004), I set out to create what was at the time an industry first: a book designed not for developers but specifically for Microsoft Windows administrators with very little VBScript experience who wanted to learn just enough VBScript to be effective. Since that book was published, Windows administrators have become more and more skilled with Windows Script Host, VBScript, Windows Management Instrumentation, and other related technolo gies. Because administrators attending conferences and viewing my Web site (http://www.ScriptingAnswers.com) are beginning to ask questions about more complex technologies and techniques, the time has come for a book that covers advanced topics. In this book, my :ble co-author, Jeffery Hicks, and I try to cover some of the more advanced scripting techniques that we use every day. We certainly aren't pretending that we touch on every topic that might be considered "advanced"; after all
密码学涉及解决通信保密问题的计算系统的概念、定义及构造。密码系统的设计必须基于坚实的基础。本书对这一基本问题给出了系统而严格的论述:用已有工具来定义密码的目标并解决新的密码学问题。全书集中讨论了基本的数学工具:计算困难性、伪随机性以及零知识证明等。本书的重点是澄清基本概念及证明密码学问题解决方法的可行性。而不侧重于对特殊方法的描述。