Today’s data-protecting encryption is safe for now, but could fall to the power of quantum computing. : Computers based on quantum physics are poised to open vistas in medicine, manufacturing, and finance, exploiting subatomic properties to run massive numbers of calculations simultaneously. Yet these emerging quantum computers’ staggering power to weigh possibilities could also render some of today’s data-protecting encryption schemes lame within a decade or two, touching off a race to keep business and government data safe.