1、PKI中撤銷證書是通過維護(hù)一個證書撤銷列表CRL來實現(xiàn)的。以下不會導(dǎo)致證書被撤銷的是（  ）。
A.密鑰泄漏
B.系統(tǒng)升級
C.證書到期
D.從屬變更

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2、 雜湊函數(shù)SHAI的輸入分組長度為（）比特
A、128
B、258
C、512
D、1024

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3、 特洛伊木馬攻擊的威脅類型屬于（）
A、授權(quán)侵犯威脅
B、滲入威脅
C、植入威脅
D、旁路控制威脅

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4、 以下關(guān)于加密技術(shù)的敘述中，錯誤的是（）
A、對稱密碼體制的加密密鑰和解密密鑰是相同的
B、密碼分析的目的就是千方百計地尋找密鑰或明文
C、對稱密碼體制中加密算法和解密算法是保密的
D、所有的密鑰都有生存周期

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5、下列關(guān)于公鑰體制中說法不正確的是（）
A.在一個公鑰體制中，一般存在公鑰和私鑰兩種密鑰
B.公鑰體制中僅根據(jù)加密密鑰來去確定解密密鑰在計算上是可行的
C.公鑰體制中的關(guān)于可以以明文方式發(fā)送
D.公鑰密碼中的私鑰可以用來進(jìn)行數(shù)字簽名

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6、確保信息僅被合法實體訪問，而不被泄露給非授權(quán)的實體或供其利用的特性是指信息的（  ）。
A.完整性
B.可用性
C.保密性
D.不可抵賴性

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7、 以下關(guān)于VPN的敘述中，正確的是（）
A、VPN指的是用戶通過公用網(wǎng)絡(luò)建立的臨時的、安全的連接
B、VPN指的是用戶自己租用線路，和公共網(wǎng)絡(luò)物理上完全隔離的、安全的線路
C、VPN不能做到信息認(rèn)證和身份認(rèn)證
D、VPN只能提供身份認(rèn)證，不能提供數(shù)據(jù)加密的功能

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8、IPSec協(xié)議可以為數(shù)據(jù)傳輸提供數(shù)據(jù)源驗證、無連接數(shù)據(jù)完整性、數(shù)據(jù)機(jī)密性、抗重播等安全服務(wù)。其實現(xiàn)用戶認(rèn)證采用的協(xié)議是（  ）。
A. IKE協(xié)議
B. ESP協(xié)議
C. AH協(xié)議
D. SKIP協(xié)議

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9、下面對國家秘密定級和范圍的描述中，不符合《中華人民共和國保守國家秘密法》要求的是（  ）。
A、對是否屬于國家和屬于何種密級不明確的事項,可由各單位自行參考國家要求確定和定級,然后報國家保密工作部門備案
B、各級國家機(jī)關(guān)、單位對所產(chǎn)生的秘密事項,應(yīng)當(dāng)按照國家秘密及其密級的具體范圍的規(guī)定確定密級,同時確定保密期限和知悉范圍
C、國家秘密及其密級的具體范圍,由國家行政管理部門]分別會同外交、公安、國家安全和其他中央有關(guān)機(jī)關(guān)規(guī)定
D、對是否屬于國家和屬于何種密級不明確的事項,由國家保密行政管理部門,或省、自治區(qū)、直轄市的保密行政管理部門確定

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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.collisions
B.image
C.preimage
D.solution

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