The following is a true story: I went for a hike. It was lovely. As I was finishing — two hours and 1,700 vertical feet later — I realized I’d dropped the keys to my vehicle somewhere along the trail.

Hackers are always trying to get into places they’re not supposed to be. The bad ones steal your stuff, hold it for ransom, and generally wreak havoc with the place. The good ones use the same methods ...