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信息安全工程師每日一練試題內(nèi)容(2021/1/26)
試題1: “如果一條鏈路發(fā)生故障,那么只有和該鏈路相連的終端才會(huì)受到影響”,這一說法是適合于以下哪一種拓?fù)浣Y(jié)構(gòu)的網(wǎng)絡(luò)的?()
A.星型
B.樹型
C.環(huán)型
D.復(fù)合型
下列關(guān)于信息系統(tǒng)生命周期中實(shí)施階段所涉及主要安全需求描述錯(cuò)誤的是:()
A.確保采購定制的設(shè)備、軟件和其他系統(tǒng)組件滿足已定義的安全要求
B.確保整個(gè)系統(tǒng)已按照領(lǐng)導(dǎo)要求進(jìn)行了部署和配置
C.確保系統(tǒng)使用人員已具備使用系統(tǒng)安全功能和安全特性的能力
D.確保信息系統(tǒng)的使用已得到授權(quán)
(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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