The U.S. government has charged Samuel Tunick with allegedly typing in a passcode to wipe his phone before officers could search it. “I hope people understand that the charges against me are meant to intimidate people,” he said.

The case centers on Tunick's use of GrapheneOS, an open-source operating system that works on Google Pixel phones and lets users enter a passcode to wipe a...

Whoops, was that the duress password?