信息安全工程師每日一練試題（2023/7/24）
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信息安全工程師每日一練試題內(nèi)容（2023/7/24）
試題1
雪崩效應(yīng)指明文或密鑰的少量變化會(huì)引起密文的很大變化。下列密碼算法中不具有雪崩效應(yīng)的是（）
A.AES
B.MD5
C.RC4
D.RSA查看答案
試題參考答案：D
試題2
容災(zāi)的目的和實(shí)質(zhì)是（）
A.實(shí)現(xiàn)對(duì)系統(tǒng)數(shù)據(jù)的備份
B.提升用戶的安全預(yù)期
C.保持對(duì)信息系統(tǒng)的業(yè)務(wù)持續(xù)性
D.信息系統(tǒng)的必要補(bǔ)充查看答案
試題參考答案：C
試題3
網(wǎng)絡(luò)蠕蟲(chóng)是惡意代碼一種類型，具有自我復(fù)制和傳播能力，可以獨(dú)立自動(dòng)運(yùn)行。網(wǎng)絡(luò)蠕蟲(chóng)的四個(gè)功能模塊包括（ ）。
A．掃描模塊、感染模塊、破壞模塊、負(fù)載模塊
B．探測(cè)模塊、傳播模換、蠕蟲(chóng)引擎模塊、負(fù)載模塊
C．掃描模塊、傳播模塊、蠕蟲(chóng)引擎模塊、破壞模塊
D．探測(cè)模塊、傳播模塊、負(fù)載模塊、破壞模塊查看答案
試題參考答案：B
試題4
認(rèn)證是證實(shí)某事是否名副其實(shí)或者是否有效的一個(gè)過(guò)程。以下關(guān)于認(rèn)證的敘述中， 不正確的是（ ）。
A.認(rèn)證能夠有效阻止主動(dòng)攻擊
B.認(rèn)證常用的參數(shù)有口令、標(biāo)識(shí)符、生物特征等
C.認(rèn)證不允許第三方參與驗(yàn)證過(guò)程
D.身份認(rèn)證的目的是識(shí)別用戶的合法性，阻止非法用戶訪問(wèn)系統(tǒng)查看答案
試題參考答案：C
試題5
數(shù)據(jù)備份通?？煞譃橥耆珎浞?、增量備份、差分備份和漸進(jìn)式備份幾種方式。其中將系統(tǒng)中所有選擇的數(shù)據(jù)對(duì)象進(jìn)行一次全面的備份，而不管數(shù)據(jù)對(duì)象自上次備份之后是否修改過(guò)的備份方式是（ ）。
A.完全備份
B.增量備份
C.差分備份
D.漸進(jìn)式備份查看答案
試題參考答案：A
試題6
在DES加密算法中,子密鑰的長(zhǎng)度和加密分組的長(zhǎng)度分別是（ ）。
A.56位和64位
B.48位和64位
C.48位和56位
D.64位和64位查看答案
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查看答案
試題參考答案：D、C、A、B、A
試題8
（ ）是一種通過(guò)不斷對(duì)網(wǎng)絡(luò)服務(wù)系統(tǒng)進(jìn)行干擾,影響其正常的作業(yè)流程,使系統(tǒng)響應(yīng)減慢甚至癱瘓的攻擊方式。
A.暴力攻擊
B.拒絕服務(wù)攻擊
C.重放攻擊
D.欺騙攻擊查看答案
試題參考答案：B
試題9
計(jì)算機(jī)系統(tǒng)的安全級(jí)別分為四級(jí)：D、C（C1、C2）、B（B1、B2、B3）和A。其中被稱為選擇保護(hù)級(jí)的是（）
A. C1
B. C2
C. B1
D. B2查看答案
試題參考答案：A
試題10
為了應(yīng)對(duì)日益嚴(yán)重的垃圾郵件問(wèn)題，服務(wù)提供商設(shè)計(jì)和應(yīng)用了各種垃圾郵件過(guò)濾機(jī)制，以下耗費(fèi)計(jì)算資源最多的垃圾郵件過(guò)濾機(jī)制是（） 。
A.SMTP身份認(rèn)證大林劃
B.反向名字解析
C.內(nèi)容過(guò)濾
D.黑名單過(guò)濾查看答案
試題參考答案：C
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