But the Atlantic’s editor in chief, Jeffrey Goldberg, revealed on Monday that he had been added to a group chat with President Donald Trump’s Cabinet members about military strikes on Yemen – raising serious national security concerns.

A magazine journalist’s account of being added to a group chat of U.S. national security officials coordinating plans for airstrikes has raised questions about how highly sensitive information is supposed to be handled.

Signal has estimated 40-70 million monthly users - making it pretty tiny compared to the biggest messaging services, WhatsApp and Messenger, which count their customers in the billions. Where it does lead the way though is in security. At the core of that is end-to-end encryption (E2EE).