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信息安全工程師每日一練試題內(nèi)容（2023/4/4）
試題1
雜湊函數(shù)SHAI的輸入分組長度為（）比特
A、128
B、258
C、512
D、1024查看答案
試題參考答案：C
試題2
人為的安全威脅包括主動攻擊和被動攻擊,以下屬于被動攻擊的是（ ）。
A.流量分析
B.后門
C.拒絕服務(wù)攻擊
D.特洛伊木馬查看答案
試題參考答案：A
試題3
常見的信息安全基本屬性有：機密性、完整性、可用性、抗抵賴性和可控性等。其中合法許可的用戶能夠及時獲取網(wǎng)絡(luò)信息或服務(wù)的特性，是指信息安全的（）。
A．機密性
B．完整性
C．可用性
D．可控性查看答案
試題參考答案：C
試題4
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)designs which have been designated cryptography standards by the US government (though DES's designation was finally withdrawn after the AES was adopted).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.collisions
B.image
C.preimage
D.solution查看答案
試題參考答案：A、D、C、B、A
試題5
以下關(guān)于認證技術(shù)的敘述中，錯誤的是（）
A、指紋識別技術(shù)的利用可以分為驗證和識別
B、數(shù)字簽名是十六進制的字符串
C、身份認證是用來對信息系統(tǒng)中實體的合法性進行驗證的方法
D、消息認證能夠確定接收方收到的消息是否被篡改過查看答案
試題參考答案：B
試題6
以下網(wǎng)絡(luò)攻擊中，（）屬于被動攻擊
A、拒絕服務(wù)攻擊
B、重放
C、假冒
D、流量分析查看答案
試題參考答案：D
試題7
深度流檢測技術(shù)是一種主要通過判斷網(wǎng)絡(luò)流是否異常來進行安全防護的網(wǎng)絡(luò)安全技術(shù),深度流檢測系統(tǒng)通常不包括（ ）。
A.流特征提取單元
B.流特征選擇單元
C.分類器
D.響應(yīng)單元查看答案
試題參考答案：D
試題8
SM4是一種分組密碼算法，其分組長度和密鑰長度分別為（）。
A.64位和128位
B.128位和128位
C.128位和256位
D.256位和256位查看答案
試題參考答案：B
試題9
以下關(guān)于IPSec協(xié)議的敘述中,正確的是（ ）。
A.IPSec協(xié)議是IP協(xié)議安全問題的一種解決方案
B.IPSec協(xié)議不提供機密性保護機制
C.IPSec協(xié)議不提供認證功能
D.IPSec協(xié)議不提供完整性驗證機制查看答案
試題參考答案：A
試題10
數(shù)字水印技術(shù)通過在數(shù)字化的多媒體數(shù)據(jù)中嵌入隱蔽的水印標記，可以有效實現(xiàn)對數(shù)字多媒體數(shù)據(jù)的版權(quán)保護等功能。數(shù)字水印的解釋攻擊是以阻止版權(quán)所有者對所有權(quán)的斷言為攻擊目的。以下不能有效解決解釋攻擊的方案是（）
A.引入時間戳機制
B.引入驗證碼機制
C.作者在注冊水印序列的同時對原作品加以注冊
D.利用單向水印方案消除水印嵌入過程中的可逆性查看答案
試題參考答案：B
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