第65題： 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
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第66題： 設在RSA的公鑰密碼體制中，用于為（e，n）=（7,55），則私鑰d=（）。
A. 8
B. 13
C. 23
D. 37
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第67題： DSS數(shù)字簽名標準的核心是數(shù)字簽名算法DSA，該簽名算法中雜湊函數(shù)采用的是（）。
A. SHA1
B. MD5
C. MD4
D. SHA2
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第69題： 面向數(shù)據(jù)挖掘的隱私保護技術(shù)主要解決高層應用中的隱私保護問題，致力于研究如何根據(jù)不同數(shù)據(jù)挖掘操作的特征來實現(xiàn)對隱私的保護。從數(shù)據(jù)挖掘的角度看，不屬于隱私保護技術(shù)的是（）。
A.基于數(shù)據(jù)失真的隱私保護技術(shù)
B.基于數(shù)據(jù)匿名化的隱私保護技術(shù)
C.基于數(shù)據(jù)分析的隱私保護技術(shù)
D.基于數(shù)據(jù)加密的隱私保護技術(shù)
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第70題： 強制訪問控制（MAC）是一種不允許主體干涉的訪問控制類型。根據(jù)MAC的安全基本，用戶與訪問的信息的讀寫關系有四種類型，其中能保證數(shù)據(jù)完整性的讀寫組合方式是（）。
A.上讀-下寫
B.上讀-上寫
C.下讀-下寫
D.下讀-上寫
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第71題：

There are different ways to perform IP based DoS Attacks. The most common IP based DoS attack is that an attacker sends an extensive amount of connection establishment （1）(e.g. TCP SYN requests) to establish hanging connections with the controller or a DPS. Such a way, the attacker can consume the network resources which should be available for legitimate users. In other （2）, the attacker inserts a large amount of （3）packets to the data plane by spoofing all or part of the header fields with random values. These incoming packets will trigger table-misses and send lots of packet-in flow request messages to the network controller to saturate the controller resources. In some cases, an （4）who gains access to DPS can artificially generate lots of random packet-in flow request messages to saturate the control channel and the controller resources. Moreover, the lack of diversity among DPSs fuels fuels the fast propagation of such attacks.
Legacy mobile backhaul devices are inherently protected against the propagation of attacks due to complex and vendor specific equipment. Moreover, legacy backhaul devices do not require frequent communication with core control devices in a manner similar to DPSs communicating with the centralized controller. These features minimize both the impact and propagation of DoS attacks. Moreover, the legacy backhaul devices are controlled as a joint effort of multiple network element. For instance, a single Long Term Evilution（LTE）eNodeB  is connected up to 32 MMEs. Therefore, DoS/DDoS attack on a single core element will not terminate the entire operation of a backhaul device（5）the net work.

（1）A.message  B、information  C、requests  D、data
（2）A.methods  B、cases       C、hands    D、sections
（3）A.bad      B、real        C、fake      D、new
（4）A.user     B、administrator  C、editor   D、attacker
（5）A.or       B、of          C、in        D、to
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