6/10/2015Cookies3 Sites that know you... Just a few common examples: my.yahoo.com www.amazon.com Each time I return to these sites, they remember who I am. Yahoo remembers my news, bookmarks, etc. Amazon.com remembers what books I have browsed and makes recommendations. How do they do that?
6/10/2015Cookies4 What is a Cookie? Small piece of data generated by a web server, stored on the client’s hard drive. Controversial, as it enables web sites to track web users and their habits (more later…)
6/10/2015Cookies5 Tracking Unique Visitors Step 1: Person A requests home page for amazon.com Step 2: amazon.com Web Server generates a new unique ID. Step 3: Server returns home page plus a cookie set to the unique ID. Step 4: Each time Person A returns to amazon.com, the browser automatically sends the cookie along with web page requested.
6/10/2015Cookies6 Cookie Conversation Browser Server Give me the home page! Here’s the home page plus a cookie. Now, give me the news page (cookie is sent automatically) I’ve seen you before… Here’s the news page.
6/10/2015Cookies7 Cookie Notes Created in 1994 for Netscape 1.1 Cookies cannot be larger than 4K No domain (netscape.com, microsoft.com) can have more than 20 cookies. Cookies stay on your machine until: they automatically expire they are explicitly deleted Cookies work the same on all browsers. No cross-browser problems here!
6/10/2015Cookies8 Magical Cookies The term cookie comes from an old programming hack, called Magical Cookies. If a programmer couldn’t make two parts of a program communicate, she would create a “magical cookie”, a small text file containing data to transfer between program parts.
6/10/2015Cookies13 In Netscape 4.0 and above Netscape provides several cookie options Accept all cookies Accept only cookies that get sent back to the originating server (used to block third party ads) Disable cookies Warn me before accepting a cookie. Menu Tab: Edit -> Preferences -> Advanced
6/10/2015Cookies15 In Internet Explorer Provides several options: Prompt before accepting cookies Disable all cookie use Always accept cookies IE 5.0: Menu: Tools -> Internet Options -> Security -> Custom Level
6/10/2015Cookies18 IE Cookie Files Cookie files are stored within a cookies directory under windows: C:\windows\cookies Each cookie gets its own name. Let’s take a look...
6/10/2015Cookies19 Cookie Block Software Cookie Central has pointers to lots of cookie blocking software. Cookie Pal Cookie Crusher Cookie Cruncher etc.
6/10/2015Cookies20 Privacy Lets look at this website that provide informmation such as address, phone, email, and more: www.411.com www.411.com Yahoo: Yahoo: http://people.yahoo.com/ http://people.yahoo.com/ http://find.intelius.com/search- name.php?ReportType=8& http://find.intelius.com/search- name.php?ReportType=8&