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But are we still too vulnerable?
After all, cyber attacks have gotten more sophisticated, and more targeted to specific operations in the past couple of years.
They also often remain undetected for long periods of time. Less than 5% of cybersecurity attacks are discovered within hours, while almost 80% aren't found for weeks or months, according to Verizon's 2011 threat report.
The growing concern caused FBI Director Robert Mueller to warn last week that cyber attacks will become the No. 1 terrorist threat to the United States - which is why Congress is trying to pass the first U.S. cybersecurity law.
"We will suffer a catastrophic cyberattack," said House Intelligence Committee Chairman Rep. Mike Rogers, R-AL. "The clock is ticking."
The Stuxnet Virus
Much of the fear surrounding a U.S. cyber attack has escalated due to the Stuxnet virus.
The Stuxnet virus was first detected in June 2010 when a software security firm's Iranian client complained about a software glitch.
"As soon as we saw it, we knew it was something completely different. And red flags started to go up straightaway," Liam O Murchu, an operations manager at antivirus company Symantec Corp. (Nasdaq: SYMC), told "60 Minutes" correspondent Steve Kroft in a March 4 segment on Stuxnet.