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信息安全工程師當(dāng)天每日一練試題地址：m.xiexiliangjiufa.com/exam/ExamDay.aspx?t1=6
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信息安全工程師每日一練試題內(nèi)容（2023/5/9）
試題1
移位密碼的加密對象為英文字母，移位密碼采用對明文消息的每一個(gè)英文字母向前推移固定key位的方式實(shí)現(xiàn)加密。設(shè)key=6，則明文“SEC”對應(yīng)的密文為（）
A.YKI
B.ZLI
C.XJG
D.MYW查看答案
試題參考答案：A
試題2
網(wǎng)絡(luò)系統(tǒng)中針對海量數(shù)據(jù)的加密,通常不采用（ ）方式。
A.會(huì)話加密
B.公鑰加密
C.鏈路加密
D.端對端加密查看答案
試題參考答案：B
試題3
文件加密就是將重要的文件以密文形式存儲(chǔ)在媒介上，對文件進(jìn)行加密是一種有效的數(shù)據(jù)加密存儲(chǔ)技術(shù)?；赪indows系統(tǒng)的是（ ）。
A. AFS
B. TCFS
C. CFS
D. EFS查看答案
試題參考答案：D
試題4
PKI是一種標(biāo)準(zhǔn)的公鑰密碼的密鑰管理平臺(tái)，數(shù)字證書是PKI的基本組成部分。在PKI中，X.509數(shù)字證書的內(nèi)容不包括（）。
A.加密算法標(biāo)識(shí)
B.簽名算法標(biāo)識(shí)
C.版本號
D.主體的公開密鑰信息查看答案
試題參考答案：A
試題5
S/Key口令是一種一次性口令生產(chǎn)方案，它可以對抗（）
A、惡意代碼木馬攻擊
B、拒絕服務(wù)攻擊
C、協(xié)議分析攻擊
D、重放攻擊查看答案
試題參考答案：D
試題6
信息通過網(wǎng)絡(luò)進(jìn)行傳輸?shù)倪^程中，存在著被篡改的風(fēng)險(xiǎn)，為了解決這一安全問題，通常采用的安全防護(hù)技術(shù)是（）
A、加密技術(shù)
B、匿名技術(shù)
C、消息認(rèn)證技術(shù)
D、數(shù)據(jù)備份技術(shù)查看答案
試題參考答案：C
試題7
等級保護(hù)2.0對于應(yīng)用和數(shù)據(jù)安全，特別增加了個(gè)人信息保護(hù)的要求。以下關(guān)于個(gè)人信息保護(hù)的描述中，錯(cuò)誤的是（）。
A.應(yīng)僅采集和保存業(yè)務(wù)必需的用戶個(gè)人信息
B.應(yīng)禁止未授權(quán)訪問和使用用戶個(gè)人信息
C.應(yīng)允許對用戶個(gè)人信息的訪問和使用
D.應(yīng)制定有關(guān)用戶個(gè)人信息保護(hù)的管理制度和流程查看答案
試題參考答案：C
試題8
計(jì)算機(jī)系統(tǒng)的安全級別分為四級：D、C（C1、C2）、B（B1、B2、B3）和A。其中被稱為選擇保護(hù)級的是（）
A. C1
B. C2
C. B1
D. B2查看答案
試題參考答案：A
試題9
（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查看答案
試題參考答案：D、A、C、B、A
試題10
Trust is typically interpreted as a subjective belief in the reliability， honesty and security of an entity on which we depend （ ）our welfare .In online environments we depend on a wide spectrun of things , ranging from computer hardware,software and data to people and organizations. A security solution always assumes certain entities function according to specific policies.To trust is precisely to make this sort of assumptions , hence , a trusted entity is the same as an entity that is assumed to function according to policy . A consequence of this is that a trust component of a system must work correctly in order for the security of that system to hold, meaning that when a trusted（ ）fails , then the sytems and applications that depend on it can（ ）be considered secure.An often cited articulation of this principle is:＂ a trusted system or component is one that can break your security policy” ( which happens when the trust system fails ). The same applies to a trusted party such as a service provider ( SP for short )that is , it must operate according to the agreed or assumed policy in order to ensure the expected level of securty and quality of services . A paradoxical conclusion to be drawn from this analysis is that security assurance may decrease when increasing the number of trusted components and parties that a service infrastructure depends on . This is because the security of an infrastructure consisting of many.
Trusted components typically follows the principle of the weakest link , that is ,in many situations the the overall security can only be as strong as the least reliable or least secure of all the trusted components. We cannot avoid using trusted security components,but the fewer the better. This is important to understand when designing the identity management architectures,that is, fewer the trusted parties in an identity management model , stronger the security that can be achieved by it.
The transfer of the social constructs of identity and trust into digital and computational concepts helps in designing and implementing large scale online markets and communities,and also plays an important role in the converging mobile and Internet environments.Identity management (denoted Idm hereafter ) is about recognizing and verifying the correctness of identitied in online environment .Trust management becomes a component of （ ）whenever different parties rely on each other for identity provision and authentication . IdM and Trust management therefore depend on each other in complex ways because the correctness of the identity itself must be trusted for the quality and reliability of the corresponding entity to be trusted.IdM is also an essential concept when defining authorisation policies in personalised services.
Establishing trust always has a cost, so that having complex trust requirement typically leads to high overhead in establishing the required trust. To reduce costs there will be incentives for stakeholders to “cut corners”regarding trust requirements ,which could lead to inadequate security . The challenge is to design IdM systems with relatively simple trust requirements.Cryptographic mechanisms are often a core component of IdM solutions,for example,for entity and data authentication.With cryptography,it is often possible to propagate trust from where it initially exists to where it is needed .The establishment of initial（ ）usually takes place in the physical world,and the subsequent propagation of trust happens online,often in an automated manner.
（71）A.with
B. on
C. of
D. for
（72）A.entity
B.person
C.component
D.thing
（73）A. No longer
B. never
C. always
D.often
（74）A. SP
B. IdM
C.Internet
D.entity
（75）A.trust
B.cost
C.IdM
D. solution查看答案
試題參考答案：D、C、A、B、A
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