Government officials continue to seek technology companies’ help fighting terrorism and crime. But the most commonly proposed solution would severely limit regular people’s ability to communicate securely online. End-to-end is important, but security experts have warned for years that the most vulnerable place for your data is not during transit from place to place, but rather when it’s stored or displayed at one end or the other – on a screen, on a disk, in memory or on some device in the cloud. Why are we most vulnerable at the endpoint? Because we don’t like to be inconvenienced, and because adding more protection makes our devices harder to use, the same way putting multiple locks on a door makes it harder to get in, for both the homeowner and the burglar.