President Barack Obama asked Congress to pass tough new legislation to combat what he called "the evolving threat of cyber-attacks," warning the U.S. faces heightened risks if policy makers don't act.

His call for congressional action is the latest reflection of the federal government's beefed-up focus on the threat of cyber-attacks following a large-scale theft and destruction of data at Sony Pictures Entertainment Inc., which White House officials have blamed on North Korea.

"No foreign nation, no hacker, should be able to shut down our networks, steal our trade secrets, or invade the privacy of American families, especially our kids," Mr. Obama said in his State of the Union speech. "We are making sure our government integrates intelligence to combat cyber-threats, just as we have done to combat terrorism."

The White House plans to host a cyber-attack summit with government and business leaders at Stanford University next month, and officials across a range of agencies are having internal discussions on whether to rework the government's defenses against attacks. Mr. Obama is also sending a special envoy to China in the hopes of ramping up pressure on North Korea to halt what the White House believes is a growing use of computer hacking.

Congress has tried, but so far failed, to pass an overhaul of laws that govern cyber-theft. The issue has come into sharp focus in recent months. The Twitter and YouTube accounts of U.S. Central Command were also hacked last week, an embarrassment for the military, though no classified information appears to have been compromised.

There are limits to what the White House is seeking. Mr. Obama has called for steeper penalties for people convicted of computer hacking, but the White House hasn't specified how it might punish foreign countries for stealing information, a growing concern following the Sony breach.

A key stumbling block in the effort to toughen cyber-laws is a concern among some U.S. companies that sharing information with the government could expose them to shareholder lawsuits or a customer exodus.

Companies have also complained that certain government agencies are using surveillance to steal corporate and customer information. Highlighting some of the privacy concerns, Mr. Obama said in the speech that intelligence agencies have "worked hard" to "build more safeguards against potential abuse."

It's unclear whether these White House overtures will persuade companies to soften their opposition to previous information-sharing proposals. White House officials haven't said how more information sharing might have prevented the Sony breach.

Meanwhile, lawmakers on Capitol Hill have signaled they plan to act on some version of new laws to defend against cyber-attacks, but deliberations are in early stages.

"My committee is currently working on cyber-security legislation to remove any unnecessary legal barriers for the private sector to share cyber-threat information," said House Homeland Security Committee Chairman Michael McCaul (R., Texas). He said he would review the White House's proposal.

There is an active debate unfolding within the government, among law enforcement, intelligence and military leaders, about how laws to prevent cyber-attacks should be refashioned.

If officials can agree on a single approach, that could affect the direction of congressional talks. So far, those discussions are in early stages, though a National Security Agency official recently called the Sony breach a "game changer." Responsibility for dealing with cyber-crimes is now spread between multiple federal agencies.

The number of "cyber-incidents," which the government classifies as breaches of computer-security measures, has jumped in recent years, hitting 228,700 in 2013, according to the Department of Homeland Security.

Reflecting how this has become a top government concern, Mr. Obama devoted more of his State of the Union speech to highlighting the risk of cyber-attacks than in 2014, when he mentioned the risk in passing as part of a broader discussion about foreign policy.

Mr. Obama said that if Congress doesn't act, "we'll leave our nation and our economy vulnerable. If we do, we can continue to protect the technologies that have unleashed untold opportunities for people around the globe."

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