is the science of hiding information.Whe

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问题 is the science of hiding information.Whereas.the goal of cryptography is tomake dataulueadable by a third party,the goal of steganography is to hide the data from athirdparty.In this article,I will discuss what steganography is;what purposes it serves,and will provide an example using available software. There is?a large number of steganographic（）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?spreads?spectrum radio communication.With computers and networks,there are many other ways of hiding information,such as: >Covert channels(e.g.,Loki and some distributed denial-of-service tools use the Internet Control（）Protocol,or ICMP,as the communications?channel?between the"bad guy"and a compromised system) >Hidden text within web pages >Hiding files in"plain?sight"(e.g.,what better place to"hide a file than with an important sounding name in the c:\winnt\system32 directory?） >Null ciphers(e.g.,using the first letter of each word?to?from?a?hidden message in and otherwise innocuous text) Steganography today,however,is significantly more（）than the examples above suggest,allowing a user to hide large amounts of infromation within image and audio files.these forms of steganography often are used in conjunction with cryprography so that the information is doubly protected;first it is encrypted and then hidden so that an adversary has to first find the information(an often difficult task in and of itself)and then?decrypt it. The simplest approach to hiding data within an image flile is callde（）significant bit insertion in this method we can take the binary?representation of the hidden data and overwirit the bit of each byte within the cover image.if we are using 24-bit color the amount of change?well be mininmal and indiscerible to the human?eye.问题1选项A.CryptographyB.GeographyC.StenographyD.Steganography问题2选项A.methodsB.SofteareC.ToolsD.Services问题3选项A.MemberB.managementC.messageD.Mail问题4选项A.powerfulB.SophisticatedC.AdvancdeD.easy问题5选项A.lesastB.MostC.MuchuD.less

选项

答案 DACBA

解析译文：
信息隐藏学是隐藏信息的科学。而密码学的目的是让数据对于第三方不可识别，而信息隐藏学的目的则是将数据对于第三方隐藏起来。本文，我将论述信息隐藏学是什么、它的目的是什么，并且会提供使用可行软件的案例。
有许多信息隐藏的方法实际上我们都很熟悉（特别是如果你看过一些谍战片！），从隐型墨水和微小的点点，到将信息暗含在一大段文字的每个单词的第二个字母中，还有无线通信中的扩频技术等等。使用计算机和网络，有许多其他的隐藏信息的方法，比如：
转换信道（e.g.，洛基和一些分布式拒绝服务工具使用网际控制管理协议，或叫做ICMP，作为“坏人”和受攻击的系统之间的通信信道）
隐藏信息在网页中
隐藏文件在“眼皮儿底下”（比如，隐藏信息在什么地方比给它取一个重要的熟悉名字放置在目录c:\winnt\system32中更好？）
空域算法（比如，使用一段毫不相干的文字中每个单词的首写字母来表示一个隐藏的信息）
隐写术在今天，然而明显比上面的例子更强大，允许用户隐藏大量的信息在图像和音频文件，这些形式的隐写术通常用于结合密码学，信息是双重保护的。
最简单的方法来隐藏数据，是将信息嵌入在图像文件的像素位上（LSB），在这种方法中，我们可以把隐藏的二进制表示数据和覆盖的每个字节的图片，如果我们使用的是24位颜色，数量的变化是最小的并且肉眼是看不见的。

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本试题收录于：中级信息安全工程师题库软件水平考试初中高级分类

中级信息安全工程师

软件水平考试初中高级

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is the science of hiding information.Whe

中级信息安全工程师

软件水平考试初中高级

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