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信息安全工程師每日一練試題內(nèi)容（2021/8/19）

試題1： SM3密碼雜湊算法的消息分組長(zhǎng)度為（  ）比特。
A.64
B.128
C.512
D.1024
試題解析與討論：m.xiexiliangjiufa.com/st/3899024824.html
試題參考答案：C

試題2： 下列說(shuō)法中,錯(cuò)誤的是（  ）。
A.數(shù)據(jù)被非授權(quán)地增刪、修改或破壞都屬于破壞數(shù)據(jù)的完整性
B.抵賴是一種來(lái)自黑客的攻擊
C. 非授權(quán)訪問(wèn)是指某一資源被某個(gè)非授權(quán)的人,或以非授權(quán)的方式使用
D.重放攻擊是指出于非法目的,將所截獲的某次合法的通信數(shù)據(jù)進(jìn)行拷貝而重新發(fā)送
試題解析與討論：m.xiexiliangjiufa.com/st/3894624014.html
試題參考答案：B

試題3：

在以下網(wǎng)絡(luò)威脅中，（）不屬于信息泄露
A、數(shù)據(jù)竊聽(tīng)
B、流量分析
C、偷竊用戶賬戶
D、暴力破解

試題解析與討論：m.xiexiliangjiufa.com/st/2845612952.html
試題參考答案：D

試題4： 面向數(shù)據(jù)挖掘的隱私保護(hù)技術(shù)主要解高層應(yīng)用中的隱私保護(hù)問(wèn)題，致力于研究如何根據(jù)不同數(shù)據(jù)挖掘操作的特征來(lái)實(shí)現(xiàn)對(duì)隱私的保護(hù)，從數(shù)據(jù)挖的角度,不屬于隱私保護(hù)技術(shù)的是（  ）。
A.基于數(shù)據(jù)分析的隱私保護(hù)技術(shù)
B.基于微據(jù)失真的隱私保護(hù)技術(shù)
C.基于數(shù)據(jù)匿名化的隱私保護(hù)技術(shù)
D.基于數(shù)據(jù)加密的隱私保護(hù)技術(shù)
試題解析與討論：m.xiexiliangjiufa.com/st/3893114145.html
試題參考答案：A

試題5：

數(shù)字簽名最常見(jiàn)的實(shí)現(xiàn)方法是建立在（）的組合基礎(chǔ)之上
A、公鑰密碼體制和對(duì)稱(chēng)密碼體制
B、對(duì)稱(chēng)密碼體制和MD5摘要算法
C、公鑰密碼體制和單向安全散列函數(shù)算法
D、公證系統(tǒng)和MD4摘要算法

試題解析與討論：m.xiexiliangjiufa.com/st/2845924106.html
試題參考答案：C

試題6：

有一種攻擊是不斷對(duì)網(wǎng)絡(luò)服務(wù)系統(tǒng)進(jìn)行干擾，改變其正常的作業(yè)流程，執(zhí)行無(wú)關(guān)程序使系統(tǒng)響應(yīng)減慢甚至癱瘓。這種攻擊叫做（）
A、重放攻擊
B、拒絕服務(wù)攻擊
C、反射攻擊
D、服務(wù)攻擊

試題解析與討論：m.xiexiliangjiufa.com/st/2846424079.html
試題參考答案：B

試題7： 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
試題解析與討論：m.xiexiliangjiufa.com/st/389944612.html
試題參考答案：D、C、A、B、A

試題8： 強(qiáng)制訪問(wèn)控制（MAC）是一種不允許主體干涉的訪問(wèn)控制類(lèi)型。根據(jù)MAC的安全基本，用戶與訪問(wèn)的信息的讀寫(xiě)關(guān)系有四種類(lèi)型，其中能保證數(shù)據(jù)完整性的讀寫(xiě)組合方式是（）。
A.上讀-下寫(xiě)
B.上讀-上寫(xiě)
C.下讀-下寫(xiě)
D.下讀-上寫(xiě)
試題解析與討論：m.xiexiliangjiufa.com/st/3275612511.html
試題參考答案：A

試題9：

以下關(guān)于加密技術(shù)的敘述中，錯(cuò)誤的是（）
A、對(duì)稱(chēng)密碼體制的加密密鑰和解密密鑰是相同的
B、密碼分析的目的就是千方百計(jì)地尋找密鑰或明文
C、對(duì)稱(chēng)密碼體制中加密算法和解密算法是保密的
D、所有的密鑰都有生存周期

試題解析與討論：m.xiexiliangjiufa.com/st/28472951.html
試題參考答案：C

試題10： SM4是一種分組密碼算法，其分組長(zhǎng)度和密鑰長(zhǎng)度分別為（）。
A.64位和128位
B.128位和128位
C.128位和256位
D.256位和256位
試題解析與討論：m.xiexiliangjiufa.com/st/3275126410.html
試題參考答案：B