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信息安全工程師每日一練試題內(nèi)容(2022/1/24)
試題1: 身份認證是證實客戶的真實身份與其所聲稱的身份是否相符的驗證過程。目前,計算機及網(wǎng)絡(luò)系統(tǒng)中常用的身份認證技術(shù)主要有:用戶名/密碼方式、智能卡認證、動態(tài)口令、生物特征認證等。其中能用于身份認證的生物特征必須具有( )。 以下關(guān)于認證技術(shù)的敘述中,錯誤的是()
A、指紋識別技術(shù)的利用可以分為驗證和識別
B、數(shù)字簽名是十六進制的字符串
C、身份認證是用來對信息系統(tǒng)中實體的合法性進行驗證的方法
D、消息認證能夠確定接收方收到的消息是否被篡改過
(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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