WASHINGTON — When the Obama administration circulated to the nation’s Internet providers last week a lengthy confidential list of computer addresses linked to a hacking group that has stolen terabytes of data from American corporations, it left out one crucial fact: that nearly every one of the digital addresses could be traced to the neighborhood in Shanghai that is headquarters to the Chinese military’s cybercommand.

That deliberate omission underscored the heightened sensitivities inside the Obama administration over just how directly to confront China’s untested new leadership over the hacking issue, as the administration escalates demands that China halt the state-sponsored attacks that Beijing insists it is not mounting.

The issue illustrates how different the worsening cyber-cold war between the world’s two largest economies is from the more familiar superpower conflicts of past decades — in some ways less dangerous, in others more complex and pernicious.

Administration officials say they are now more willing than before to call out the Chinese directly — as Attorney General Eric H. Holder Jr. did last week in announcing a new strategy to combat theft of intellectual property. But President Obama avoided mentioning China by name — or Russia or Iran, the other two countries the president worries most about — when he declared in his State of the Union address that “we know foreign countries and companies swipe our corporate secrets.” He added: “Now our enemies are also seeking the ability to sabotage our power grid, our financial institutions and our air traffic control systems.”