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信息安全工程師每日一練試題內(nèi)容(2020/11/27)
試題1: 2017年11月,在德國柏林召開的第55次ISO/IEC信息安全分技術委員會(SC27)會議上,我國專家組提出的( )算法一致通過成為國際標準。 (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
設在RSA的公鑰密碼體制中,公鑰為(c,n)=(13,35),則私鑰為()
A、11
B、13
C、15
D、17
來自終端的電磁泄露風險,因為它們:()
A.導致噪音污染
B.? 破壞處理程序
C.? 產(chǎn)生危險水平的電流
D.? 可以被捕獲并還原
下列說法中,錯誤的是()
A、服務攻擊是針對某種特定攻擊的網(wǎng)絡應用的攻擊
B、主要的滲入威脅有特洛伊木馬和陷阱
C、非服務攻擊是針對網(wǎng)絡層協(xié)議而進行的
D、對于在線業(yè)務系統(tǒng)的安全風險評估,應采用最小影響原則
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