Here's what to know about the messaging app used by Trump Administration officials to discuss military strikes on Yemen.

The Dutch General Intelligence and Security Service has raised the alarm as ongoing global attacks target users of Signal and ...

Russia is “engaged in a large-scale global attempt” to take over Signal and WhatsApp accounts, two Dutch intelligence agencies said Monday.

Government watchdogs say it’s a slippery slope for the mayor to continue using the controversial encrypted messaging app.

Former national security adviser Mike Waltz was photographed using a Signal-like messaging app during Wednesday’s Cabinet meeting, more than a month after he first came under intense scrutiny for ...

Why is Christian Science in our name? Our name is about honesty. The Monitor is owned by The First Church of Christ, Scientist, and we’ve always been transparent about that. The church publishes the ...

As national security services warn that Russian hackers are currently engaged in new global attacks against WhatsApp and Signal users, here’s how to stay safe.

Add Yahoo as a preferred source to see more of our stories on Google. Former national security adviser Mike Waltz, testified before the Senate Foreign Relations Committee in his bid to become U.N.

Signal is back in the headlines, but this time it’s not for a security breach, but rather a high-profile example of how it’s designed to work. Recent news highlighted an incident where classified ...

The Nevada DMV communicated with ICE over Signal for its work on a federal task force that it says does not relate to ...