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Impact of technology in the work place
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SECTION A III METHODOLOGY III INDEX BASED (DIRECTORIES) III HIGHLIGHTS OF ALTAVISTA. III META SEARCH SITES III SECTION B IV FIREWALLS. IV WHAT IS A FIREWALL? IV WHAT IS ENCRYPTION? IV HOW IT WORKS. IV HOW IS IT OVERCOME? IV FILTERING SOFTWARE V WHAT IS FILTERING SOFTWARE? V HOW IT WORKS V KEYWORD BLOCKING V SITE BLOCKING V WEB RATING SYSTEMS V SOME EXAMPLES OF FILTERING SOFTWARE: V COMPUTE VIRUSES VI WHAT IS A COMPUTER VIRUS? VI DIFFERENT TYPES OF VIRUSES VI HOW DO YOU RECOGNISE A HOAX? VII WHAT IS DIGITAL SIGNATURE? VIII HOW DIGITAL SIGNATURES ARE CREATED VIII STEP 1 THE HASH VIII STEP 2 ENCRYPTION VIII STEP 3 CERTIFICATION IX HOW IT WORKS IX A DIGITAL SIGNATURE MIGHT LOOK LIKE THIS. X CAN THEY BE INTERFERED WITH? X SECTION C XI TERMS OF REFERENCE XI FINDINGS. XI 1) HOW INFECTION OCCURS XI 2) PARASITE VIRUSES XI HOW THEY ATTACK XI MACRO VIRUSES XII WHAT ARE THEY? XII 4) BOOT SECTION VIRUSES XII WHAT IS THE BOOT SECTOR? XII TROJAN HORSE XII WORMS XII 5) E-MAIL VIRUSES XII CONCLUSIONS XIII RECOMMENDATIONS XIII BIBLIOGRAPHY XIV SECTION A METHODOLOGY Index Based (Directories) Index sites use web-indexing robots or (web crawler/spider as they are typically referred to in the search world) The crawler collects documents from the web to build the index. It is a software programme designed to follow hyperlinks through a web site, retrieving and indexing pages to document the site for searching purposes. The crawler goes to a web address (URL) and downloads the HTML page. The Data Base Associated with these search engines is divided into several categories, and sub categories according to how they gather information. This allows the searcher to search for results in an organised fashion. Directories such as Alta Vista are good at identifying general information; a search for the phrase “Internet firewalls” produced a result of 17,640 while Yahoo returned 44,200 though Yahoo returned the most results Alta Vista results were more relevant to my search. Highlights of AltaVista. Delivers Internet's first Web index (1995) First multilingual search capabilities on the Internet First Internet search engine to launch Image, Audio, and Video search capabilities Most advanced Internet search features and capabilities: multimedia search, translation and language recognition, and speciality search Index Search Engines will find individual Web Pages that contain the words the user searched for, and rank them in importance according to the number of times the word appears on a page Other index sites are Google and Ask Jeeves. META SEARCH SITES Meta Search Sites send searches to several Search Engines. These Engines do not allow for input of many search variables, however their best use is to find information on obscure topics, or to see if something is available on the Internet. SECTION B FIREWALLS. What is a firewall? Firewall definition – a computer network firewall is an electronic blocking mechanism that will not allow unauthorised intruders into a computer system. A computer firewall is a software programme that blocks potential hackers from individual computers or computer networks. Basically, a firewall is a barrier to keep destructive forces away from your property. In fact that is why it is called a firewall its job is similar to a physical firewall that keeps a fire from spreading from one area to the next. Technologies like IPP (Internet Printing Protocol) and Web DAV (Web-based Distributed Authoring and Versioning) are designed to skirt firewall configurations, while other protocols billed as “firewall friendly” actually circumvent them, to provide rapid access. Even when firewalls are in place, It is difficult to rely on them to block the onslaught of tainted packets, because the packets’ addresses constantly change, Encryption What is Encryption? Encryption is a code. It allows the storing of information on paper or anywhere else in a form, which allows only authorised personnel to understand and use it. If an unauthorised person were to look at the information they would only see sequences of meaningless characters and symbols. How it works. An Encryption System is designed so that the process of converting the Encryption information is allowed only under two conditions. The first of these conditions is that the person attempting to decrypt the information must have the Encryption System, which in modern times is likely to be a specially designed computer programme. The second condition is that the person must also have a piece of information called Encryption’s Keys (specifically devised codes). How is it overcome? The first common method of attack is called brute force attack. This method is used against some common Encryption Systems, where there is knowledge that a certain Key is used to encrypt the plain text and the Hacker also has knowledge of the Algorithm* used and possesses an example of the plain text and corresponding cipher text.
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