Ahnlab, the country's leading online security firm, is among those whose Web sites are still under attack. The site froze before fully loading while displaying a broken link to a "DDoS attack warning."
"Distributed denial of service" (DDoS) attacks are designed to disrupt rather than penetrate a system to obtain data.
Targeted Web sites are saturated with access requests generated by malicious software planted on personal computers, crippling or slowing server response to legitimate traffic.
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