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信息安全工程師每日一練試題內(nèi)容(2022/2/11)
試題1: (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
以下關(guān)于隧道技術(shù)說(shuō)法不正確的是()
A、隧道技術(shù)可以用來(lái)解決TCP/IP協(xié)議的某種安全威脅問(wèn)題
B、隧道技術(shù)的本質(zhì)是用一種協(xié)議來(lái)傳輸另外一種協(xié)議
C、IPSec協(xié)議中不會(huì)使用隧道技術(shù)
D、虛擬專(zhuān)用網(wǎng)中可以采用隧道技術(shù)
一個(gè)全局的安全框架必須包含的安全結(jié)構(gòu)因素是()
A、審計(jì)、完整性、保密性、可用性
B、審計(jì)、完整性、身份認(rèn)證、保密性、可用性
C、審計(jì)、完整性、身份認(rèn)證、可用性
D、審計(jì)、完整性、身份認(rèn)證、保密性
以下關(guān)于數(shù)字證書(shū)的敘述中,錯(cuò)誤的是()
A、證書(shū)通常由CA安全認(rèn)證中心發(fā)放
B、證書(shū)攜帶持有者的公開(kāi)密鑰
C、證書(shū)的有效性可以通過(guò)驗(yàn)證持有者的簽名
D、證書(shū)通常攜帶CA的公開(kāi)密鑰
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