it-e-61 Computer Security | 自留地
it-e-61 Computer Security 由 农夫一号 发表于 七月 26th, 2011 The techniques developed to protect single computers and network-linked computer systems from accidental or intentional harm are called computer security. <a href="http://www.selingsoft.com/monster-headphones-c-84.html"><strong>beats by dre headphones</strong></a> Such harm includes destruction of computer hardware and software, physical loss of data, and the deliberate invasion of databases by unauthorized individuals. Data may be protected by such basic methods as locking up terminals and replicating data in other storage facilities. Most sophisticated methods include limiting data access by requiring the user to have an encoded card or to supply an identification number or password. Such procedures can apply to the computer-data system as whole or may be pinpointed for particular information banks or programs. Data are frequently ranked in computer files according to degree of confidentiality. Operating systems and programs may also incorporate built-in safeguards, and data may be encoded in various ways to prevent unauthorized persons from interpreting or even copying the material. The encoding system most widely user in the United States is the Data <a href="http://www.selingsoft.com/products_all.html"><strong>dre beats</strong></a> Encryption Standard (DES) designed by IBM and approved for use by the National Institute of that are then repeated several times. Very large-scale computer systems, for example, the U.S. military’s Advanced Research Project Agency Network (ARPANET), may be broken up into smaller subsystems for security purposes, but smaller system in government and industry <a href="http://www.selingsoft.com/monster-headphones-c-84.html"><strong>beats headphones</strong></a> are more prone to system-wide invasions. At the level of personal computers, security possibilities are fairly minimal. Most invasions of computer systems are for international or corporate spying or sabotage, but computer hackers may take the penetration of protected databanks as a challenge, often with no object in mind other than accomplishing a technological feat. Of growing concern is the deliberate implantation in computer programs of worms or viruses that, if undetected, may progressively destroy databases and other software. Such infected programs have appeared in the electronic bulletin boards available to computer users. Other viruses have been incorporated into computer software sold commercially. No real protection is available against such bugs except the vigilance of manufacturer and user. 1, invasion [in'veiʒən] n. 入侵，侵略；侵*；侵犯 2, <a href="http://www.weightlossfree.net/user_blog.php"><strong>Hair Straightener Zoom GHD IV Purple Styler 17 - ヤプ*グ</strong></a> sophisticated [sə'fistikeitid] adj. 复杂的；精致的；久经世故的；富有 验的 v. 使变得世故；使迷惑；篡改（sophisticat e的过去分词形式） 3, pinpointed v. 指出*确的位置；准确地找到（pinpoint 的过去分词） 4, sabotage ['sæbətɑ:ʒ, ,sæbə'tɑ:ʒ] vt. 妨害；对…采取*坏行动 vi. 从事*坏活动 n. *坏；*坏活动；*工 5, penetration [,peni'treiʃən] n. 渗透；突*；侵入；洞察力 6, implantation [,implɑ:n'teiʃən, -plæn-] n. 移植；灌输；鼓吹 7, vigilance ['vidʒiləns] n. *戒，*觉；*醒症 Tags: english, it
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