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Examples: service denial
1990: US 800 service down (4 hours)
1991: Major cities lose phones (8 hours)
1992: Survey shows US losses at $4 billion
1993: Email overload attacks 80% effective
1994: Rolling blackouts shut down US
1995: Comp-U-Serve loses 40,000 Emails
1996: Western states power blackout cascade failure
1997: Net protocol attacks widely exploited for denial
1998: Internet-based NT denial on national scale
1999: Melissa brings down major sites for >24 hours
2000: DCAs on major e-commerce firms hits the press
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