Servers based in South Korea and China are the most commonly used in attacks on the Internet, following servers housed in the United States, according to a study released Monday by an infrastructure consulting firm. Using its more than 50 . . .

Servers based in South Korea and China are the most commonly used in attacks on the Internet, following servers housed in the United States, according to a study released Monday by an infrastructure consulting firm. Using its more than 50 sensors around the Internet to study more than 12 million probes and attacks, New York-based Predictive Systems found that 49 percent of all attacks took advantage of servers in the United States, 17 percent used South Korean servers, and about 15 percent used servers based in China.

While the results don't suggest which nations have the most hackers, they do indicate that unsecured infrastructure is often co-opted by attackers in other countries and poses a significant risk to others connected to the Internet, said Richard Smith, a senior information security analyst with Predictive.

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