U.S. intelligence agencies intercepted an encrypted Iranian signal that federal officials believe could be linked to the activation of dormant operatives inside the United States, according to threat ...

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.

U.S. intelligence officials are warning law enforcement agencies to stay alert after intercepting encrypted communications believed to be linked to Iran and possibly connected to covert operatives ...

Signal, the encrypted messaging app trusted by security-savvy users around the world, has confirmed that hackers have managed to takeover accounts — with government officials and journalists among ...