米国：北朝鮮の原子力システムに対してStuxnet類似のプログラムを感染させることを試みたけれども失敗？

下記の記事が出ている。

　Report: US tried Stuxnet variant on N. Korean nuke program, failed
　ars technica: May 30, 2015
　http://arstechnica.com/security/2015/05/report-us-tried-stuxnet-variant-on-n-korean-nuke-program-failed/

　Exclusive: U.S. tried Stuxnet-style campaign against North Korea but failed - sources
　REUTERS: May 29, 2015
　http://www.reuters.com/article/2015/05/29/us-usa-northkorea-stuxnet-idUSKBN0OE2DM20150529

　The US tried to sabotage North Korea's nuclear program with targeted malware
　Verge: May 29, 2015
　http://www.theverge.com/2015/5/29/8688895/north-korea-nuclear-program-stuxnet-us-malware