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信息安全工程师每日一练试题内容（2021/3/3）

试题1：

目前使用的防杀病毒软件的作用是（）
A、检查计算机是否感染病毒，清除已感染的任何病毒
B、杜绝病毒对计算机的侵害
C、查出已感染的任何病毒，清除部分已感染病毒
D、检查计算机是否感染病毒，清除部分已感染病毒

试题解析与讨论：www.cnitpm.com/st/284845084.html
试题参考答案：D

试题2： ISO制定的安全体系结构描述了5种安全服务，以下不属于这5种安全服务的是（）
A.鉴别服务
B.数据报过滤
C.访问控制
D.数据完整性
试题解析与讨论：www.cnitpm.com/st/3270424021.html
试题参考答案：B

试题3： 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4： 关于祖冲之算法的安全性分析不正确的是（  ）。
A.祖冲之算法输出序列的随机性好,周期足够大
B.祖冲之算法的输出具有良好的线性、混淆特性和扩散特性
C.祖冲之算法可以抵抗已知的序列密码分析方法
D.祖冲之算法可以抵抗弱密分析
试题解析与讨论：www.cnitpm.com/st/3897722685.html
试题参考答案：B

试题5：

以下关于安全套接层协议（SSL）的叙述中，错误的是（）
A、是一种应用层安全协议
B、为TCP/IP连接提供数据加密
C、为TCP/IP连接提供服务器认证
D、提供数据安全机制

试题解析与讨论：www.cnitpm.com/st/284953163.html
试题参考答案：A

试题6： 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7： 如果破译加密算法所需要的计算能力和计算时间是现实条件所不具备的,那么就认为相应的密码体制是（  ）。
A.实际安全
B.可证明安全
C.无条件安全
D.绝对安全
试题解析与讨论：www.cnitpm.com/st/3899110708.html
试题参考答案：A

试题8： A.数字证书和PKI系统相结合
B.对称密码体制和MD5算法相结合
C.公钥密码体制和单向安全Hash函数算法相结合
D.公钥密码体制和对称密码体制相结合
试题解析与讨论：www.cnitpm.com/st/3893927027.html
试题参考答案：C

试题9： 属于第二层的VPN隧道协议是（）。
A.IPSec
B.PPTP
C.GRE
D.IPv4
试题解析与讨论：www.cnitpm.com/st/3274424726.html
试题参考答案：B

试题10： The modern study of symmetric-key ciphers relates mainly to the study of block ciphers and stream ciphers and to their applications. A block cipher is, in a sense, a modern embodiment of Alberti's polyalphabetic cipher: block ciphers take as input a block of （71 ）and a key, and output a block of ciphertext of the same size. Since messages are almost always longer than a single block, some method of knitting together successive blocks is required. Several have been developed, some with better security in one aspect or another than others. They are the mode of operations and must be carefully considered when using a block cipher in a cryptosystem.
The Data Encryption Standard (DES) and the Advanced Encryption Standard (AES) are( 72 )designs which have been designated cryptography standards by the US government (though DES's designation was finally withdrawn after the AES was adopted). Despite its deprecation as an official standard, DES (especially its still-approved and much more secure triple-DES variant) remains quite popular; it is used across a wide range of applications, from ATM encryption to e-mail privacy and secure remote access. Many other block ciphers have been designed and released, with considerable variation in quality. Many have been thoroughly broken. See Category: Block ciphers.
Stream ciphers, in contrast to the ‘block’type, create an arbitrarily long stream of key material, which is combined ( 73 )the plaintext bit-by-bit or character-by-character, somewhat like the one-time pad. In a stream cipher, the output( 74 )is created based on an internal state which changes as the cipher operates. That state change is controlled by the key, and, in some stream ciphers, by the plaintext stream as well. RC4 is an example of a well-known, and widely used, stream cipher; see Category: Stream ciphers.
Cryptographic hash functions (often called message digest functions) do not necessarily use keys, but are a related and important class of cryptographic algorithms. They take input data (often an entire message), and output a short fixed length hash, and do so as a one-way function. For good ones, ( 75 ) (two plaintexts which produce the same hash) are extremely difficult to find.
Message authentication codes (MACs) are much like cryptographic hash functions, except that a secret key is used to authenticate the hash value on receipt. These block an attack against plain hash functions.
（71）
A.plaintext
B.ciphertext
C.data
D.hash
（72）
A.stream cipher
B.hash function
C.Message authentication code
D.Block cipher
（73）
A.of
B.for
C.with
D.in
（74）
A.hash
B.stream
C.ciphertext
D.plaintext
（75）
A.collisons
B.image
C.preimage
D.solution
试题解析与讨论：www.cnitpm.com/st/4115223167.html
试题参考答案：A、D、C、B、C