【正文】 專業(yè)外文翻譯 題 目 Inter Security 系 （院） 計(jì)算機(jī)科學(xué)技術(shù)系 專 業(yè) 通信工程 班 級(jí) 2020 級(jí) 2 班 學(xué)生姓名 李華山 學(xué) 號(hào) 2020200311 指導(dǎo)教師 陳瑞斌 職 稱 講師 二 〇 一 二 年 五 月 二十 日 濱州學(xué)院畢業(yè)設(shè)計(jì) (專業(yè)外文翻譯 ) 1 Inter Security An intruder with the right background and malicious intent has many ways to infiltrate internal pany systems and work devices through the Inter connection. Once inside, the hacker has free reign to destroy, change, or steal data and these actions because various sorts of work havoc. The most popular use of the Inter, , is also insecure. The same hacker with a protocol analyzer and access to routers and other work devices can intercept or change messages. Threats like these confront such industries as Inter merce and corporations that wish to interconnect their offices through LA Ns via the Inter. The work security market is quickly responding to the threats by applying authentication and encryption technologies to the Inter and by developing new products. These products e at a time where methods of attacking user works are more elaborate and vendors are improving their products to keep up with the increased threats. “Users need these tools [because they realize] they can’t use traditional monitoring tools to stop increasingly sophisticated attacks,” says Jim Hurley, an analyst with The Aberdeen Group. This article describes various security threats and solutions needed to protect individuals and panies. Types of Inter Security Protection 1. Security Policy Inter connections will never be 100 percent secure. Rather than aiming for total security, an organization has to assess the value of the information it is trying to protect and balance that against the likelihood of a security violation and the cost of implementing various security measures. A pany’s first lineofdefense should be either to devise or to revise its security policy for the organization that takes Inter connections into account. This policy should define in detail which employees have rights to specific services. It should also educate employees about their responsibilities for protecting the organization’s information, such as protecting passwords, and clearly spell out actions that will be taken if a security violation is detected. Such a policy can be the first step, explaining to employees where the pany stands on misuse of Inter 濱州學(xué)院畢業(yè)設(shè)計(jì) (專業(yè)外文翻譯 ) 2 connections. Part of the process will require evaluating the cost to the pany of different types of security violations. Corporations will want to involve people at the highest levels of the organization in this process. Hiring a puter security consultant may be of some help. Once a panywide policy is implemented, the pany then should start evaluating the use of firewalls, encryption, and authentication. 2. Firewall A firewall is a barrier between two works, an internal work (trusted work) and an external work (untrusted work). Here the external work is the Inter. Firewalls examine ining and outgoing packets and according to a set of rules defined by the administrator, either let them through or block them out. Firewalls are not an Inter security remedy, but they are essential to the strategy. Different kinds of firewalls function differently. They scrutinize, examine, and control the work traffic in numerous ways depending on their software architecture. Below are firewalls that work in different ways. 1） Packet Filtering Firewall Technique Many routers use a firewall technique called packet filtering, which examines the source and destination addresses and ports of ining TCP and UDP packets, denying or allowing packets to enter based on a set of predefined rules set by the administrator. Packet filters are inexpensive, transparent to users, and have a negligible impact on work performance. Configuring packet filtering is a relatively plex process, requiring a precise knowledge of work, transport, and even application protocol strategy. A problem with packet filters is that they are susceptible to“IP spoofing”, a trick that hackers use to gain access to a corporate work. Intruders fool the firewall by changing Inter Protocol addresses in packet headers to ones that are acceptable. 2） The ApplicationGateway Firewall A more sophisticated and secure type of firewall is an application gateway, which is generally considered more secure than packet filters. Application gateways are programs 濱州學(xué)院畢業(yè)設(shè)計(jì) (專業(yè)外文翻譯 ) 3 written for specific Inter services such as HTTP, FTP, and tel。 applications that run on a server with two work connections, acting as a server to the application client and as a client to the application server. Application gateways evaluate work packets for valid specific data making the proxies more secure than packet filtering. Most applicationgateway firewalls also have a feature called work address translation that prevents internal IP addresses from appearing to users outside the trusted work. There are two primary disadvantages to application gateways. The first disadvantage is a performance decline caused by the proxy function’s double processing. Another is the lag time for the firewall vendor to supply an a