On Dec. 19, the FBI said that North Korea was responsible for the Sony intrusion. Many security experts, however, have remained skeptical, citing a lack of clear or publicly-disclosed evidence.
Nor has the individual or group responsible for the North Korean Internet outages been identified. Most security researchers, including ones from companies that specialize in defending customers against distributed denial-of-service (DDoS) attacks, suspect that hacktivists or petty cyber criminals used commonplace DDoS tools to flood the fragile North Korean connection with so much traffic that it became unresponsive.
Ironically, although the North Koreans have repeatedly denounced the U.S. for not revealing more evidence of the DPRK's part in the Sony hack, it did not offer any proof that the U.S. was responsible for the week's Internet blackouts.
North Korea also threatened retaliation for the outages, although it did not spell out what form that might take. Instead, it hauled out the Cold War propaganda vocabulary guidebook. "If the U.S. persists in American-style arrogant, high-handed and gangster-like arbitrary practices despite the repeated warnings of the DPRK, the U.S. should bear in mind that its failed political affairs will face inescapable deadly blows," the NDC said.
The U.S. has denied any involvement in the DPRK's Internet disruptions.
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