Kernell was a 20-year-old student at the University of Tennessee when he committed the crime.
BBC: Palin e-mail hacker sentenced to a year in custody
David Kernell guessed the answers to Ms Palin's security questions and reset her password, prosecutors said.
Kernell, son of Democratic Tennessee state legislator Mike Kernell, apologised to Mrs Palin and her family after the sentence was handed down.
The FBI traced the internet traffic to Kernell's apartment in Knoxville, Tennessee.
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