Matthew Powell

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The hacking group Shiny Hunters replaced many Canvas sites with a ransom message, prompting schools to shut the service down as finals approach.

Matthew Powell is executive director of the Missouri Cybersecurity Center of Excellence and advises clients who have been hacked.

He says Shiny Hunters is known to recruit hackers with specialized knowledge.

The hackers have given schools until May 12th to pay a ransom or see students' sensitive data released publicly.

For NPR News, I'm Stan Jastrzewski in Columbia, Missouri.