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A USC graduate student from La Cañada Flintridge has been indicted on a charge that he waged a cyberattack on a San Francisco tech company.

A grand jury handed down the indictment on Dec. 1, accusing Sean Sharma of carrying out a so-called distributed denial of service attack on the web servers belonging to Chatango, according to court papers filed in U.S. District Court.

If convicted, Sharma, 26, faces up to 10 years in prison.

The FBI said Sharma purchased a tool to carry out the DDoS attack and released it on Chatango’s servers during a more than two-month period starting Nov. 6, 2014. A DDoS attack functions by overloading a company’s servers with a glut of junk traffic, rendering them inaccessible.

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