计算机英语教程 教学课件 ppt 作者 吕云翔 杨雪 林珣_ Unit 10

1、Unit 10 Computer Security,计算机英语教程 教学课件,Contents,Part 1 Reading and Translating Section A: Computer Security Section B: Computer Virus Section C: Firewall Part 2 Simulated Writing: Business Letter Part 3 Listening and Speaking Dialogue: Using Anti-virus Software Listening Comprehension: Hacker and Cracker Dictation: Father of the Mouse Doug Engelbart,1.1 Computer Security,Introduction Security Architecture Hardware Mechanisms that Protect Computers and Data Secure Operating Systems Secure Coding

2、Applications,1.1 Computer Security,Complex Sentences Original: If the operating environment is not based oin a secure operating system capable of maintaining a domain for its own execution, and capable of protecting application code from malicious subversion, and capable of protecting the system from subverted code, then high degrees of security are understandably not possible. Translation:如果操作环境不是基于一个安全的操作系统能够维持自己的执行域，并能保护应用程序代码免受恶意破坏，以及保护系统免受破坏代码损害，那么高安全程度是显然不可能的。,1.1 Computer Security,Exercis

3、es I. Read the following statements carefully, and decide whether they are true (T) or false (F) according to the text. _1Computer security is a branch of technology arranged under information security category. _2Physically limiting access to computers is approximately one of the strongest approaches to improve computer security. _3Computer programming strategies are often considered as the most dependent approach for computer security among others. _4In aviation, transmitting unauthorized comm

4、unications over specific radio frequencies may spoof air traffic controllers or simply disrupt communications altogether. _5The issues of computer security are an indispensable part of maintaining an operational industry.,1.1 Computer Security,II. Choose the best answer to each of the following questions. 1What is the primary difference of computer security from some other computer science fields? AIts varied objectives BIts positive enforceable rules CIts negative requirements DIts impractical

5、for most computer programs,C,1.1 Computer Security,II. Choose the best answer to each of the following questions. 2Which of the following strategies is demonstrated via the example of“the Bell-LaPadula model” belongs? ASecure Architecture BSecure Operating Systems CSecure Coding DSecure Hardware Mechanisms,D,1.1 Computer Security,II. Choose the best answer to each of the following questions. 3Which of the following is NOT argued in the instances of computer security accidents in aviation? AHuman

6、 error BComputer malfunction CHackers intruding DElectromagnetic interference,B,1.1 Computer Security,III. Translating. 1. Original: The objective of computer security includes protection of information and property from theft,corruption or natural disaster, while allowing the information and property to remain accessible and productive to its intended users. Translation: 2. Original Other accidental and intentional faults have caused significant disruption of safety critical systems throughout

7、the last few decades and dependence on reliable communication and electrical power only jeopardizes computer safety. Translation:,1.2 Computer Virus,Introduction Infection Strategies Vulnerability and Countermeasures Disadvantages,1.2 Computer Virus,Complex Sentences Original: Just as genetic diversity in a population decreases the chance of a single disease wiping out a population, the diversity of software systems on a network similarly limits the destructive potential of viruses. Translation:

8、正像在种群中的遗传多样性降低了某种单一疾病灭绝种群的可能性，网络中软件系统的多样性也类似地限制了病毒的破坏性潜力。,1.2 Computer Virus,Exercises I. Read the following statements carefully, and decide whether they are true (T) or false (F) according to the text. _1Windows is by far the most popular operating system for virus writers due to their market dominance. _2Bugs in software generally means potential exploits for the spread of viruses. _3The method of using a heuristic algorithm to find viruses can detect viruses which havent yet been defined in

9、the current database of known virus “signatures”. _4The backups on CD/DVD are always safe because the media becomes read-only and can no longer be affected by a virus. _5Anti-virus software can enhance the underlying capability of host software to prevent viruses transmitting.,1.2 Computer Virus,II. Choose the best answer to each of the following questions. 1Which of the following is RIGHT about the infection strategies of viruses? AViruses may take advantage of present network services to facilitate their spread BAll original viruses must modify the copies in metamorphic viruses for spread CThe success of viruses all relies on their fast infection rate to spread DAll viruses pretend that they are executable files in order to replicate themselves,B,1.2 Computer Virus,II. Choose the best answer to each of the following questions. 2Which of the following is NOT an effective countermeasure to viruses? AUpdating operating system regu

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