Cyberspace and Society Lecture Notes 3

O a web crawler is a computer program that is

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o A web crawler is a computer program that is automated to methodically visit web sites. o A search engine indexer is software that culls keywords from a web page and stores them in a database o A search engine’s query processor looks for your search terms in search engine’s indexed database and returns list of relevant web sites o Link popularity is measured by quantity and quality of links from one web page to others Spam o Spam is unwanted electronic junk mail about medical products, low-cost loans, and fake software upgrades that arrives in your online mailbox o A spam filter is a type of utility software that captures unsolicited email messages before they reach your inbox. Phishing o An email based scam designed to persuade you to reveal confidential information o If you don’t want to become a phishing victim, be suspicious of email messages that supposedly come from banks, ISPs, online payment services, operating system publishers, and online merchants Fake sites o Looks legitimate but has been created by a third party to be a very clever replica of a legitimate web site o Pharming is an exploit that redirects users to fake sites by “poisoning” a domain name server with false IP address
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