一．操作系统的地位 计算机系统由硬件系统和软件系统组成。 软件系统是指使计算机完成特定工作的程序的总称。 硬件系统是指组装成计算机本体和设备的具有机械、电、磁、声、光等不同物理特性的各种器件和部件

课程内容： 一、操作系统的一般性工作原理 二、Linux实现技术

一、概述 二、 SPSS13.0的界面的认识 三、 变量的定义和数据的输入 四、 数据常用的一些编辑 五、 常用统计学方法 六、 曲线的绘制

You are the CEO of Coca-Cola. You are responsible for bringing a refreshing taste to zillions of people all over the world, but want to keep the recipe secret from Pepsi’s industrial spies

Diffie-Hellman Diffie-Hellman is a public key distribution scheme First public-key type scheme, proposed in 1976. W Diffie, M E Hellman, \New directions in Cryptography\, IEEE Trans. Information

Public-Key Applications can classify uses into 3 categories: – encryption/decryption (provide secrecy) – digital signatures (provide authentication) – key exchange (of session keys)

A. J. Menezes, P. C. van Oorschot and S. A. Vanstone. Handbook of Applied Cryptography, CRC Press, 1997. Bruce Schneier. Applied Cryptography, Second Edition: Protocols, Algorthms, and Source Code in C (cloth) John Wiley & Sons, Inc.) 1996 Douglas R. Stinson, Cryptography (Theory and Practice), CRC Press 1995 Resources

Security Attack: Any action that compromises the security of information. Security Mechanism: A mechanism that is designed to detect, prevent, or recover from a security attack. Security Service: A service that enhances the security of data processing systems and information transfers. A security service makes use of one or more security mechanisms

Definition: Group A set G of elements and operator @ form a group if: for all x,y in G, x @ y is also in G (inclusion) there is an identity element e such that for all x in G, e@x = x for all x in G, there is an inverse element x

Numbers Integers Real Arithmetic Operations Addition and subtraction Multiplication and division Exponentiation and logarithm