问题 单项选择题

IS0 7498-2标准涉及到的5种安全服务是 (14) 。可信赖计算机系统评价准则 (TCSEC)把计算机系统的安全性分为4大类7个等级,其中的C2级是指 (15)

A.安全标记保护

B.自主式安全保护

C.结构化安全策略模型

D.受控的访问保护

答案

参考答案:D

解析:

[分析]:
在IS07498-2中描述了开放系统互联安全的体系结构,提出设计安全的信息系统的基础架构中应该包含5种安全服务(安全功能)、能够对这5种安全服务提供支持的8类安全机制和普遍安全机制以及需要进行的5种OSI安全管理方式。其结构如图12-1所示。
TCSEC将安全分为4个方面,分别是安全政策、可说明性、安全保障和文档。在美国国防部虹系列(Rainbow Series)标准中有详细的描述。该标准将以上4个方面分为7个安全级别,从低到高依次为D、C1、C2、B1、B2、B3和 A级。
[*]
A类:验证设计。形式化证明的安全。用于绝密级。
B类:
B3:安全域保护。提供可信设备的管理和恢复。即使计算机系统崩溃,也不会泄密。
B2:结构化安全策略模型。满足B1类要求外,提供强制性控制。
B1:安全标记保护。满足C类要求,并提供数据标记。
C类:
C2:受控的访问保护。在C1之上,增加了访问保护和审计跟踪功能。
C1:自主安全保护。无条件的访问控制,具有识别和控制的责任。
D类:最低保护。例如未加任何实际的安全措施。

单项选择题 A1/A2型题
阅读理解

Antinuclear Demonstration

Police fired tear gas and arrested more than 5,000 passively resisting protestors Friday in an attempt to break up the largest antinuclear demonstration ever staged in the United States. More than 135,000 demonstrators confronted police on the construction site of a 1,000-megawatt nuclear power plant scheduled to provide power to most of southern New Hampshire. Organizers of the huge demonstration said, the protest was continuing despite the police actions. More demonstrators were arriving to keep up the pressure on state authorities to cancel the project. The demonstrator had charged that the project was unsafe in the densely populated area, would create thermal pollution in the bay, and had no acceptable means for disposing of its radioactive wasters. The demonstrations would go on until the jails and the courts were so overloaded that the state judicial system would collapse.

Governor Stanforth Thumper insisted that there would be no reconsideration of the power project and no delay in its construction set for completion in three years. “This project will begin on time and the people of this state will begin to receive its benefits on schedule. Those who break the law in misguided attempts to sabotage the project will be dealt with according to the law,” he said. And police called in reinforcements from all over the state to handle the disturbances.

The protests began before dawn Friday when several thousand demonstrators broke through police lines around the cordoned-off construction site. They carried placards that read “No Nukes is Good Nukes,” “Sun-power, Not Nuclear Power,” and “Stop Private Profits from Public Peril.” They defied police order to move from the area. Tear gas canisters fired by police failed to dislodge the protestors who had come prepared with their own gas masks or facecloths. Finally gas-masked and helmeted police charged into the crowd to drag off the demonstrators one by one. The protestors did not resist police, but refused to walk away under their own power. Those arrested would be charged with unlawful assembly, trespassing, and disturbing the peace.

小题1:What were the demonstrators protesting about?

A Private profits.     B Nuclear Power Station.

C The project of nuclear power construction.   D Public peril.

小题2:Who had gas-masks?

A Everybody.    B A part of the protestors.

C Policemen.    D Both B and C.

小题3:Which of the following was NOT mentioned as a reason for the demonstration?

A Public transportation.    B Public peril.

C Pollution.             D Disposal of wastes.

小题4:With whom were the jails and courts overloaded?

A With prisoners.        B With arrested demonstrators.

C With criminals.        D With protestors.

小题5:What is the attitude of Governor Stanforth Thumper toward the power project and the demonstration?

A stubborn.       B insistent.     C insolvable.        D remissible.