本书主要面向广大随身听爱好者，内容包括当前主流随身听(CD/MD/MP3/TAPE)的发展历史、技术原理、应用技巧，购买指南、维护保养等全面的知识。本书内容深入浅出，图文并茂，着重时尚和全面两个亮点，具有很高的实用和收藏价值，是广大随身听爱好者的手册。
![[正版包邮]密码学基础Goldreich电子工业出版社](http://img3m5.ddimg.cn/98/7/11771052875-1_l.jpg)
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。
Official exam prep guidemplus practice testsm now updated for Windows XP Service Pack 2 Ace your preparation for the skills measured by MCP Exam 70-270-and on the job--with this official Microsoft study guide, now fully updated for Windows XP Service Pack 2 with Advanced Security Tech-nologies, plus other key topics. Work at your own pace through a system of lessons, hands-on exercises, troubleshooting labs, and review questions. Maximize your performance on the exam by learning how to: Perform an installation or upgrade, including remote deployment Configure and customize the desktop environment Administer disks, device drivers, printers, file systems, and other resources Manage TCP/IP networking and support remote and mobile users Monitor, troubleshoot, and tune system performance NEW--Administer security settings and services, including the advancesin Windows XP Service Pack 2.
