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信息安全工程師每日一練試題內(nèi)容(2021/9/23)
試題1: 以下關(guān)于數(shù)字證書的敘述中,錯誤的是()
A、證書通常由CA安全認(rèn)證中心發(fā)放
B、證書攜帶持有者的公開密鑰
C、證書的有效性可以通過驗證持有者的簽名
D、證書通常攜帶CA的公開密鑰
目前使用的防殺病毒軟件的作用是()
A、檢查計算機是否感染病毒,清除已感染的任何病毒
B、杜絕病毒對計算機的侵害
C、查出已感染的任何病毒,清除部分已感染病毒
D、檢查計算機是否感染病毒,清除部分已感染病毒
病毒的引導(dǎo)過程不包含()
A、保證計算機或網(wǎng)絡(luò)系統(tǒng)的原有功能
B、竊取系統(tǒng)部分內(nèi)存
C、使自身有關(guān)代碼取代或擴充原有系統(tǒng)功能
D、刪除引導(dǎo)扇區(qū)
以下不屬于網(wǎng)絡(luò)安全控制技術(shù)的是()
A、防火墻技術(shù)
B、訪問控制
C、入侵檢測技術(shù)
D、差錯控制
不屬于物理安全威脅的是()
A、自然災(zāi)害
B、物理攻擊
C、硬件故障
D、系統(tǒng)安全管理人員培訓(xùn)不夠
(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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