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Impact of Computers on Society

Impact of Computers on Society. 3B. – Encryption and Security Intro. Web Sites of the Week. Web sites page of the syllabus. This Week’s News. CNN Hit by Rinbot (c|net) Wifi Tells a Lot About You (c|net) Harsh Words on the Web (WPost) Digital Film Distribution (IBT). Myth of the Week.

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Impact of Computers on Society

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  1. Impact of Computerson Society 3B. – Encryption and Security Intro

  2. Web Sites of the Week • Web sites page of the syllabus

  3. This Week’s News • CNN Hit by Rinbot (c|net) • Wifi Tells a Lot About You (c|net) • Harsh Words on the Web (WPost) • Digital Film Distribution (IBT)

  4. Myth of the Week • Connecting to a web site is just like telephoning a friend. • Phone calls are analog and require a dedicated circuit. • Internet connections are digital. • The Internet uses “stateless” protocols. • Fragmented messages are sent back and forth in packets.

  5. Packet Transmissions • Messages are segmented • Segments are numbered • Segments are put into packets • Each packet has a from: and a to: address • Packets may take different routes to their destination • Reduces network congestion • Increases security • Message is “reassembled” when it is received • Missing packets may be re-transmitted

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