イランのハッカーが米国海軍の軍事用ネットワークのハッキングに成功していた？

下記の記事が出ている。

　Iranians hacked Navy network for four months? Not a surprise.
　ars technica: February 20, 2014
　http://arstechnica.com/information-technology/2014/02/iranians-hacked-navy-network-for-4-months-not-a-surprise/

　Iranian hack of US Navy network was more extensive and invasive than previously reported
　Verge: February 18, 2014
　http://www.theverge.com/2014/2/18/5421636/us-navy-hack-by-iran-lasted-for-four-months-say-officials