Donald Trump says he was invited by King Charles to visit the UK and a date in September may be set. Listen below to the ...

Signal's encryption protocol is open source, meaning anyone that it's freely available for anyone to inspect, use or modify. The encryption protocol is also used by another popular chat service ...

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 ...