An image of the Signal app is shown on a mobile phone in San Francisco, March 18. LONDON — A magazine journalist's account of being added to a group chat of U.S. national security officials ...

WhatsApp uses Signal's encryption protocol, so your chats and calls are just as end-to-end encrypted as those on Signal. But ...

It is unclear whether a phone issued to Witkoff by the U.S. government or a personal device was included in the Signal chat, but U.S. officials have been discouraged from using the messaging app ...