White House says classified systems not hacked

US officials insisted Tuesday that a cyber attack late last year did not compromise White House classified systems, but refused to confirm reports Russia was behind the breach.

Cyber attackers leaving warning 'messages': NSA chief

Attackers hacking into American computer networks appear to be leaving "cyber fingerprints" to send a message that critical systems are vulnerable, the top US cyber-warrior said Thursday.

Major US health insurer hacked, affecting 11 million

Premera Blue Cross said Tuesday its computer network had been hacked, potentially exposing data from 11 million people, in the second recent such attack on a major US health insurer.

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