David E. Sanger

Because our government has been so incompetent at protecting its highly sophisticated cyberweapons, those weapons have been stolen out of the electronic vaults of the National Security Agency and the C.I.A. and shot right back at us.

We have spent so much time worrying about a 'cyber Pearl Harbor,'' the attack that takes out the power grid, that we have focused far too little on the subtle manipulation of data that can mean that no election, medical record, or self-driving car can be truly trusted.

As we put autonomous cars on the road, connect Alexas to our lights and our thermostats, put ill-protected Internet-connected video cameras on our houses, and conduct our financial lives over our cell phones, our vulnerabilities expand exponentially.