From today’s print edition of The Washington Post come a pair of alarming stories about how Chinese hackers and terrorist groups have infiltrated our electric power grid and are using our own digital infrastructure against us. A piece on page A4 talks about cyber spies having left behind software backdoors on networks connected to the U.S. power grid. A story on the front page warns that terrorist groups who have sworn to destroy the United States are taking full advantage of Web site hosting and registration services here in our backyard. The stories each are a fascinating read, but both have been told before. Hackers motivated by financial gain have been both infiltrating power networks and using our Internet infrastructure against us for years. The main differences these stories highlight are in attribution — that is, who’s responsible — and intent, or their implied goals. For example, most malicious software,