FBI Warns Russian Intelligence Hackers Target Signal Backup Recovery Keys

The FBI and CISA have updatedtheir March warningabout Russian intelligence phishing Signal accounts, and the operators have added a step: they now coax targets into handing over their Signal Backup Recovery Key. Hand it over once, and the attacker can restore the account's backup, read the private and group message history, and take over the account. Worse, the key keeps working.