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The South Korean president's website was down temporarily, and some South Korean media outlets were also hacked. Some North Korean websites also were affected. It's unclear who is responsible for the attacks.
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The Estonian capital is dotted with medieval towers and Soviet architecture that belie its status as one of the world's most technologically advanced cities. Residents use a smart card to ride the bus, and mail packages and pay for parking with their phones.
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During their two days of talks in California, the leaders reportedly enjoyed "unique, positive and constructive" discussions and forged broad agreement on North Korea.
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The Pentagon recently released a report directly accusing China of using cyberweapons to gain a military advantage with the U.S. The scope of the problem, and the damage done by cyber-espionage, is not clear. But the issue will be on the agenda when President Obama meets China's new president, Xi Jinping, in California on Friday.
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After being victimized, The Onion published tips to avoid being hacked. One suggestion: Move site to a new Web address every few minutes. The website has about 5 million followers.
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U.S. official displeasure has grown over the problem of Chinese cyber-espionage. The Obama administration has signaled that it will step up the investigation and prosecution of trade-secret theft and has not ruled out punitive measures.
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In a new report, the Department of Defense says that China's government is directly responsible for hacking into U.S. diplomatic, economic and defense networks.
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The suspect arrested in Spain is thought to have perpetrated what's been described as the biggest distributed denial-of-service attack in the history of the Internet.
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The Associated Press, NPR and the BBC have all had their Twitter accounts hijacked in recent weeks. Hacks of high-profile accounts have real-world consequences, and the security at Twitter is coming under increased scrutiny.
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One day after suspending its account because of a hacking, the wire service says it is back on Twitter.