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信息安全工程师每日一练试题内容（2022/1/19）

试题1： A方有一对密钥（KApub，KApri），B方有一对密匙（KBpub，KBpri），A方给B方发送信息M，对信息M加密为：M ‘ = KBpub（KApri（M））。B方收到密文，正确的解决方案是（）
A. KBpub（KApri（M ‘ ））
B. KBpub（KApub（M ‘ ））
C. KApub（KBpri（M ‘ ））
D. KBpri（KApri（M ‘ ））
试题解析与讨论：www.cnitpm.com/st/3272224096.html
试题参考答案：C

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： IP地址欺骗的发生过程，下列顺序正确的是（）。①确定要攻击的主机A；②发现和他有信任关系的主机B；③猜测序列号；④成功连接，留下后面；⑤将B利用某种方法攻击瘫痪。
A.①②⑤③④
B.①②③④⑤
C.①②④③⑤
D.②①⑤③④
试题解析与讨论：www.cnitpm.com/st/3273328170.html
试题参考答案：A

试题4：

以下关于隧道技术说法不正确的是（）
A、隧道技术可以用来解决TCP/IP协议的某种安全威胁问题
B、隧道技术的本质是用一种协议来传输另外一种协议
C、IPSec协议中不会使用隧道技术
D、虚拟专用网中可以采用隧道技术

试题解析与讨论：www.cnitpm.com/st/2850118239.html
试题参考答案：C

试题5： 无线传感器网络容易受到各种恶意攻击，以下关于其防御手段说法错误的是（）。
A.采用干扰区内节点切换频率的方式抵御干扰
B.通过向独立多路径发送验证数据来发现异常节点
C.利用中心节点监视网络中其它所有节点来发现恶意节点
D.利用安全并具有弹性的时间同步协议对抗外部攻击和被俘获节点的影响
试题解析与讨论：www.cnitpm.com/st/3274326177.html
试题参考答案：C

试题6： 设在RSA的公钥密码体制中，用于为（e，n）=（7,55），则私钥d=（）。
A. 8
B. 13
C. 23
D. 37
试题解析与讨论：www.cnitpm.com/st/327521419.html
试题参考答案：C

试题7： X.509数字证书的内容不包括（）。
A.版本号
B.签名算法标识
C.加密算法标识
D.主体的公开密钥信息
试题解析与讨论：www.cnitpm.com/st/327479174.html
试题参考答案：C

试题8： 计算机系统的安全级别分为四级：D、C（C1、C2）、B（B1、B2、B3）和A。其中被称为选择保护级的是（）
A. C1
B. C2
C. B1
D. B2
试题解析与讨论：www.cnitpm.com/st/3273210010.html
试题参考答案：A

试题9： 文件加密就是将重要的文件以密文形式存储在媒介上，对文件进行加密是一种有效的数据加密存储技术。基于Windows系统的是（  ）。
A. AFS
B. TCFS
C. CFS
D. EFS
试题解析与讨论：www.cnitpm.com/st/4110015512.html
试题参考答案：D

试题10： （  ）攻击是指借助于客户机/服务器技术,将多个计算机联合起来作为攻击平台，对一个或多个目标发动DoS攻击，从而成倍地提高拒绝服务攻击的威力。
A.缓冲区溢出
B.分布式拒绝服务
C.拒绝服务
D. 口令
试题解析与讨论：www.cnitpm.com/st/4114823197.html
试题参考答案：B