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信息安全工程师每日一练试题内容（2021/8/19）

试题1： SM3密码杂凑算法的消息分组长度为（  ）比特。
A.64
B.128
C.512
D.1024
试题解析与讨论：www.cnitpm.com/st/3899024824.html
试题参考答案：C

试题2： 下列说法中,错误的是（  ）。
A.数据被非授权地增删、修改或破坏都属于破坏数据的完整性
B.抵赖是一种来自黑客的攻击
C. 非授权访问是指某一资源被某个非授权的人,或以非授权的方式使用
D.重放攻击是指出于非法目的,将所截获的某次合法的通信数据进行拷贝而重新发送
试题解析与讨论：www.cnitpm.com/st/3894624014.html
试题参考答案：B

试题3：

在以下网络威胁中，（）不属于信息泄露
A、数据窃听
B、流量分析
C、偷窃用户账户
D、暴力破解

试题解析与讨论：www.cnitpm.com/st/2845612952.html
试题参考答案：D

试题4： 面向数据挖掘的隐私保护技术主要解高层应用中的隐私保护问题，致力于研究如何根据不同数据挖掘操作的特征来实现对隐私的保护，从数据挖的角度,不属于隐私保护技术的是（  ）。
A.基于数据分析的隐私保护技术
B.基于微据失真的隐私保护技术
C.基于数据匿名化的隐私保护技术
D.基于数据加密的隐私保护技术
试题解析与讨论：www.cnitpm.com/st/3893114145.html
试题参考答案：A

试题5：

数字签名最常见的实现方法是建立在（）的组合基础之上
A、公钥密码体制和对称密码体制
B、对称密码体制和MD5摘要算法
C、公钥密码体制和单向安全散列函数算法
D、公证系统和MD4摘要算法

试题解析与讨论：www.cnitpm.com/st/2845924106.html
试题参考答案：C

试题6：

有一种攻击是不断对网络服务系统进行干扰，改变其正常的作业流程，执行无关程序使系统响应减慢甚至瘫痪。这种攻击叫做（）
A、重放攻击
B、拒绝服务攻击
C、反射攻击
D、服务攻击

试题解析与讨论：www.cnitpm.com/st/2846424079.html
试题参考答案：B

试题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
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8： 强制访问控制（MAC）是一种不允许主体干涉的访问控制类型。根据MAC的安全基本，用户与访问的信息的读写关系有四种类型，其中能保证数据完整性的读写组合方式是（）。
A.上读-下写
B.上读-上写
C.下读-下写
D.下读-上写
试题解析与讨论：www.cnitpm.com/st/3275612511.html
试题参考答案：A

试题9：

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10： SM4是一种分组密码算法，其分组长度和密钥长度分别为（）。
A.64位和128位
B.128位和128位
C.128位和256位
D.256位和256位
试题解析与讨论：www.cnitpm.com/st/3275126410.html
试题参考答案：B