America’s enemies are growing bolder and more sophisticated in cyberspace. To fend them off, the government must stop unilaterally disarming.

Two recent reports underscore the danger. In mid-October, Seattle-based cybersecurity firm F5 Inc. acknowledged a “catastrophic” breach of its systems, which may have allowed Chinese hackers to penetrate networks used by federal agencies and Fortune 500 companies. Less than a week later, a congressionally mandated watchdog, the Cyberspace Solarium Commission, warned that US cyber readiness had for the first time regressed since the body was formed five years ago. Nearly a quarter of the group’s recommendations judged to have been “fully implemented” had lost that status.

Much of the damage has occurred at the Cybersecurity and Infrastructure Securi

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