You can invite someone to Signal using the "Invite Friends" menu in the app, which will send a text message or email.

To lock Signal, open its in-app settings and select "Screen Lock." It'll use the same security method and passcode that your ...

Some strategies on how to best use Signal to keep your messaging secure. Some strategies on how to best use Signal to keep your messaging secure. is a senior science reporter covering energy and the ...

The chat app, which is run by a nonprofit foundation, has been downloaded 220 million times. Here's what to know about Signal, including who owns it and whether it's safe to use. The messaging app ...