1、SM2算法是国家密码管理局于2010年12月17日发布的椭圆曲线公钥密码算法，在我们国家商用密码体系中被用来替换（  ）算法。
A. DES
B. MD5
C. RSA
D. IDEA

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2、以下关于网络流量监控的叙述中,不正确的是（  ）。
A.网络流量监控分析的基础是协议行为解析技术
B.数据采集探针是专门用于获取网络链路流量数据的硬件设备
C.流量监控能够有效实现对敏感数据的过滤
D.流量监测中所监测的流量通常采集自主机节点、服务器、路由器接口、链路和路径等

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3、 （1）is the science of hiding information. Whereas the goal of cryptography is to make data unreadable by a third party. the goal of steganography is to hide the data from a third party. In this article, I will discuss what steganography is, what purposes it serves, and will provide an example using available software.
There are a large number of steganographic （2）that most of us are familiar with (especially if you watch a lot of spy movies), ranging from invisible ink and microdots to secreting a hidden message in the second letter of each word of a large body of text and spread spectrum radio communication. With computers and networks, there are many other ways of hiding informations, such as:
Covert channels (c,g, Loki and some distributed denial-of-service tools use the Internet Control （3）Protocol, or ICMP, as the communication channel between the “bad guy”and a compromicyed system)
Hidden text within Web pages
Hiding files in “plain sight”(c,g. what better place to “hide”a file than with an important sounding name in the c:\winnt system32 directory)
Null ciphers(c,g, using the first letter of each word to form a hidden message in an otherwise innocuous text)
steganography today, however, is significantly more （4）than the example about suggest, allowing a user to hide large amounts of information within image and audio. These forms of steganography often are used in conjunction with cryptography so the information is double protected; first it is encrypted and then hidden so that an advertisement first. find the information ( an often difficult task in and of itself) and the decrypted it.
The simplest approach to hiding data within an image file is called （5）signature insertion. In this method, we can take the binary representation of the hidden data and the bit of each byte within the covert image. If we are using 24-bit color the amount and will be minimum and indiscriminate to the human eye.
（1）A、Cryptography
B、Geography
C、Stenography
D、Steganography
（2）A、methods
B、software
C、tools
D、services
（3）A、Member
B、Management
C、Message
D、Mail
（4）A、powerful
B、sophistication
C、advanced
D、easy
（5）A、least
B、most
C、much
D、less

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4、 “如果一条链路发生故障，那么只有和该链路相连的终端才会受到影响”，这一说法是适合于以下哪一种拓扑结构的网络的？（）
A.星型
B.树型
C.环型
D.复合型

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5、Linux系统的运行日志存储的目录是（  ）。
A./var/log
B./usr/log
C./etc/log
D./tmp/log

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