TAILIEUCHUNG - Information Security: The Big Picture – Part V

The World Wide Web has become the de facto communications medium for the Internet. Millions of people use it every day to get information, communicate with coworkers, buy and sell goods, entertain themselves, and keep up to date with current events. However, most of these people have very little knowledge about how the web actually works. On this slide we will give you a brief introduction to the web and tell you everything you always wanted to know about the web but were afraid to ask. All in less than three minutes | Information Security The Big Picture - Party Stephen Fried Information Security The Big Picture - SANS GIAC 2000 1 1 Agenda General Security Introduction Telecommunications Fundamentals Network Fundamentals Network Security World Wide Web Security Information Secrecy Privacy Identification and Access Control Programmatic Security Conclusion Information Security The Big Picture - SANS GIAC 2000 2 If you are taking this course you undoubtedly know about the World Wide Web. As valuable as useful and as important to our everyday lives as the web has become it is full of security issues and problems. This section will examine those issues. 2 Everything You Always Wanted to Know About Web Communications. Servers and Clients HTTP and HTML Stateless Communications Retrieving Information - GET Sending Information - POST Information Security The Big Picture - SANS GIAC 2000 3 The World Wide Web has become the de facto communications medium for the Internet. Millions of people use it every day to get information communicate with coworkers buy and sell goods entertain themselves and keep up to date with current events. However most of these people have very little knowledge about how the web actually works. On this slide we will give you a brief introduction to the web and tell you everything you always wanted to know about the web but were afraid to ask. All in less than three minutes. All computers on the web fall into one of two categories clients or servers. Let s start with servers. A server is a computer that contains some sort of information that an organization wants to distribute. The server runs a special piece of software called a web server that takes requests from other machines figures out what the request is for finds the answer to the request and sends it back to the requesting machine. That s basically all a server does. The client machine is the machine that is doing the requesting. The client runs a piece of software called a Web browser or just browser for

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