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信息安全工程师每日一练试题（2021/10/4）在线测试：www.cnitpm.com/exam/ExamDay.aspx?t1=6&day=2021/10/4

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信息安全工程师每日一练试题内容（2021/10/4）

试题1：

设在RSA的公钥密码体制中，公钥为（c，n）=（13,35），则私钥为（）
A、11
B、13
C、15
D、17

试题解析与讨论：www.cnitpm.com/st/2850915759.html
试题参考答案：B

试题2： 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
试题解析与讨论：www.cnitpm.com/st/389944612.html
试题参考答案：D、C、A、B、A

试题3：

下列说法中，错误的是（）
A、服务攻击是针对某种特定攻击的网络应用的攻击
B、主要的渗入威胁有特洛伊木马和陷阱
C、非服务攻击是针对网络层协议而进行的
D、对于在线业务系统的安全风险评估，应采用最小影响原则

试题解析与讨论：www.cnitpm.com/st/284666620.html
试题参考答案：B

试题4：

以下关于加密技术的叙述中，错误的是（）
A、对称密码体制的加密密钥和解密密钥是相同的
B、密码分析的目的就是千方百计地寻找密钥或明文
C、对称密码体制中加密算法和解密算法是保密的
D、所有的密钥都有生存周期

试题解析与讨论：www.cnitpm.com/st/28472951.html
试题参考答案：C

试题5： 一个密码系统如果用E表示加密运算，D表示解密运算，M表示明文,C表示密文,则下面描述必然成立的是（  ）。
A. E(E(M))=C
B. D(E(M))=M
C. D(E(M))=C
D. D(D(M))=M
试题解析与讨论：www.cnitpm.com/st/389293064.html
试题参考答案：B

试题6： 安全策略表达模型是一种对安全需求与安全策略的抽象概念模型，一般分为自主访问控制模型和强制访问控制模型。以下属于自主访问控制模型的是（）
A. BLP模型
B. HRU模型
C. BN模型
D.基于角色的访问控制模型
试题解析与讨论：www.cnitpm.com/st/3272020263.html
试题参考答案：B

试题7：

深度流检测技术就是以流为基本研究对象，判断网络流是否异常的一种网络安全技术，其主要组成部分通常不包括（）
A、流特征选择
B、流特征提供
C、分类器
D、响应

试题解析与讨论：www.cnitpm.com/st/284892858.html
试题参考答案：D

试题8： 安全电子交易协议SET是由VISA和Mastercard两大信用卡组织联合开发的电子商务安全协议,以下关于SET的叙述中,正确的是（  ）。
A.SET通过向电子商务各参与方发放验证码来确认各方的身份,保证网上支付的安全性
B.SET不需要可信第三方认证中心的参与
C.SET要实现的主要目标包括保障付款安全、确定应用的互通性和达到全球市场的可接受性
D.SET协议主要使用的技术包括:流密码、公钥密码和数字签名等
试题解析与讨论：www.cnitpm.com/st/3898217226.html
试题参考答案：C

试题9： 无线传感器网络WSN是由部署在监测区域内大量的廉价微型传感器节点组成，通过无线通信方式形成的一个多跳的自组织网络系统。以下针对WSN安全问题的描述中，错误的（  ）。
A.通过频率切换可以有效抵御WSN物理层的电子干扰攻击
B.WSN链路层容易受到拒绝服务攻击
C.分组密码算法不适合在WSN中使用
D.虫洞攻击是针对WSN路由层的一种网络攻击形式
试题解析与讨论：www.cnitpm.com/st/4111825763.html
试题参考答案：C

试题10：

入侵检测系统放置在防火墙内部所带来的好处是（）
A、减少对防火墙的攻击
B、降低入侵检测
C、增加对低层次攻击的检测
D、增加检测能力和检测范围

试题解析与讨论：www.cnitpm.com/st/2849616173.html
试题参考答案：B