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信息安全工程師每日一練試題內容(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
以下關于隧道技術說法不正確的是()
A、隧道技術可以用來解決TCP/IP協(xié)議的某種安全威脅問題
B、隧道技術的本質是用一種協(xié)議來傳輸另外一種協(xié)議
C、IPSec協(xié)議中不會使用隧道技術
D、虛擬專用網中可以采用隧道技術
一個全局的安全框架必須包含的安全結構因素是()
A、審計、完整性、保密性、可用性
B、審計、完整性、身份認證、保密性、可用性
C、審計、完整性、身份認證、可用性
D、審計、完整性、身份認證、保密性
以下關于數(shù)字證書的敘述中,錯誤的是()
A、證書通常由CA安全認證中心發(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
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