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.Cryptography
B.Geography
C.Stenography
D.Steganography
问题2选项
A.methods
B.Softeare
C.Tools
D.Services
问题3选项
A.Member
B.management
C.message
D.Mail
问题4选项
A.powerful
B.Sophisticated
C.Advancde
D.easy
问题5选项
A.lesast
B.Most
C.Muchu
D.less
Advancements in （ ）have contributed to the growth of the automotive industry through the creation and evolution of self-driving vehicles.
In project human resource management , （ ）is not a source of power for the project manager.
At the project establishment stage , the feasibility study mainly includes techinical feasibility analysis , （ ）, operation environment feasibility analysis and other aspects of feasibility analysis.
（ ）is a grid that shows the project resources assigned to each work package.
Xinhua News Agency reported in January 2022，Chian will further promote the developmet of a digital economy during the 14th Five-Year Plan eriod（2021-2025）. The plan also emphasized industrial （ ）transformation.
某公司投资一个使用寿命为5年的项目，第一年年初投入1000万元，从第1年到第5年每年年末都有净现金流量300万元。则项目的静态投资回收期为（ ）年。
下图是某地的街区网络图（单位:）里），疫情防控期间，一辆消毒车从疾控中心出发，需要消杀所有的街道并返回疾控中心。该消毒车完成消杀工作至少需要运行（ ）公里 。
某公司有东部、中部、西部三个生产基地，生产的产品需要运送带甲、乙、丙、丁四个市场，从生产基地到各个市场的单位运价及产量和需求量如表所示，完成该运输任务所需的最小运费为（ ）。
某炼油厂每季度需供应合同单位汽油15吨，煤油12吨，重油12吨，该厂从甲乙两处运回原油提炼，已知两处炼油成分如表所示，从甲处采购原油价格为2000元/吨，乙处为2900元/吨，为了使成本最低，炼油厂应从甲处购15吨，乙处采购（ ）吨。
某炼油厂每季度需供应合同单位汽油15吨，煤油12吨，重油12吨，该厂从甲乙两处运回原油提炼，已知两处炼油成分如表所示，从甲处采购原油价格为2000元/吨，乙处为2900元/吨，为了使成本最低，炼油厂应从甲处购（ ）吨，乙处采购20吨。
