A former Pentagon hacker pleaded guilty last week to hacking US banks in a scheme believed to have cost banks at least $10m.
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The Israeli hacker, whom former Israeli prime minister Benjamin Netanyahu once described as "damned good" and "very dangerous", was earlier arrested in Canada for allegedly stealing about $1.5m from Canadian banks.
He was extradited to the US before Canadian authorities could prosecute him where he was charged with conspiracy to commit access-device fraud and access-device fraud.
Tenenbaum now faces up to 15 years in prison.
Tenenbaum hacks into US military systems: