Chapter The Web and E-mail Chapter Contents Section A: Web Technology Section B: Search Engines Section C: E-commerce Section D: E-mail Section E: Web and E-mail Security Chapter 7: The Web and E-mail SECTION Web Technology A Web Basics HTML HTTP Web Browsers Cookies Web Page Authoring HTML Scripts Chapter 7: The Web and E-mail Web Basics The Web is an interlinked collection of document, image, video, and sound files A Web site contains a collection of related information Podcasts, Videocasts RSS Chapter 7: The Web and E-mail Web Basics  A Web page is the product or output of one or more Web-based files displayed in a format similar to a page in a book  A Web browser is client software that displays Web page elements and handles links between pages  Every Web page has a unique address called a URL Chapter 7: The Web and E-mail HTML Set of specifications for creating documents that a browser can display as a Web page Markup language HTML tags XHTML DHTML Ajax Chapter 7: The Web and E-mail HTML Chapter 7: The Web and E-mail 7 HTTP HTTP messages flow between a browser and a Web server Chapter 7: The Web and E-mail Web Browsers  Help you access Web pages  Popular browsers: – – – – Internet Explorer Mozilla Firefox Apple Safari Opera Chapter 7: The Web and E-mail Web Browsers Helper applications extend browser’s ability to work with file formats – A plug-in is a type of helper application – A player is any helper application or plug-in that helps a browser display a particular file format Chapter 7: The Web and E-mail 10 Netiquette – Use smileys and text messaging shorthand cautiously – Use the Bcc function for group mailings – Don’t send replies to all recipients – Don’t send huge attachments – Explain attachments – Stay alert for viruses – Notify recipients of viruses Chapter 7: The Web and E-mail 36 E-mail Technology E-mail systems carry and manipulate e-mail messages – E-mail servers – Based on store-and-forward technology Three types of e-mail systems widely used today: – POP – IMAP – Web-based e-mail Chapter 7: The Web and E-mail 37 E-mail Technology  A POP server is a computer that stores your incoming messages until they can be transferred to your hard disk – E-mail client software – SMTP server Chapter 7: The Web and E-mail 38 E-mail Technology Web-based e-mail accounts allow you to use a browser to access your e-mail messages Chapter 7: The Web and E-mail 39 Web and E-mail Security SECTION E Cookie Exploits Fake Sites Spam Phishing Chapter 7: The Web and E-mail 40 Cookie Exploits An ad-serving cookie can track your activities at any site containing banner ads from a third party Chapter 7: The Web and E-mail 41 Cookie Exploits  A Flash cookie, also called a local shared object, is the Flash equivalent of a conventional Web cookie  A Web bug or clear GIF is typically a 1x1 pixel graphic embedded in a Web page or e-mail message It is almost invisible due to its size, and is designed to track who’s reading the Web page or e-mail message  Antispyware is a type of security software designed to identify and neutralize Web bugs, ad-serving cookies, and other spyware Chapter 7: The Web and E-mail 42 Cookie Exploits  Individuals who prefer not to leave a trail of their Internet activities surf through an anonymous proxy service, which uses an intermediary, or proxy, server to relay Web page requests after masking the originating IP address Chapter 7: The Web and E-mail 43 Fake Sites  A fake Web site looks legitimate, but has been created by a third party to be a very clever replica of a legitimate Web site  Pharming is an exploit that redirects users to fake sites by “poisoning” a domain name server with a false IP address Chapter 7: The Web and E-mail 44 Spam  Spam is unwanted electronic junk mail about medical products, low-cost loans, and fake software upgrades that arrives in your online mailbox  A spam filter is a type of utility software that captures unsolicited e-mail messages before they reach your inbox  To combat spam sent by hijacked botnet computers, e-mail authentication techniques, such as Sender ID and DomainKeys, verify that e-mail messages originate from the Internet domain from which they claim to have been sent Chapter 7: The Web and E-mail 45 Spam Chapter 7: The Web and E-mail 46 Phishing Phishing is an e-mail based scam designed to persuade you to reveal confidential information, such as your bank account number or Social Security number If you don’t want to become a phishing victim, be suspicious of e-mail messages that supposedly come from banks, ISPs, online payment services, operating system publishers, and online merchants Chapter 7: The Web and E-mail 47 Example: Phishing Chapter 7: The Web and E-mail Basics 1: Computers and Digital 48 Phishing Chapter 7: The Web and E-mail 49 Chapter Complete The Web and E-mail ... server Chapter 7: The Web and E-mail 38 E-mail Technology ? ?Web- based e-mail accounts allow you to use a browser to access your e-mail messages Chapter 7: The Web and E-mail 39 Web and E-mail. .. The Web and E-mail 29 SECTION E-mail D ? ?E-mail Overview Netiquette ? ?E-mail Technology Chapter 7: The Web and E-mail 30 E-Mail Overview Any person with an e-mail account can send and receive e-mail. .. e-mail messages Chapter 7: The Web and E-mail 31 E-Mail Overview Basic e-mail activities – Writing – Reading – Replying – Forwarding Chapter 7: The Web and E-mail 32 E-Mail Overview ? ?E-mail attachments