CISA, the US Cybersecurity and Infrastructure Security Agency, has issued a new warning that cybercriminals and state-backed hacking groups are using spyware to compromise smartphones belonging to users of popular encrypted messaging apps such as Signal, WhatsApp, and Telegram.
In an advisory released this week, CISA warns that malicious hackers are not trying to crack the end-to-end encryption used by the apps directly to secure conversations, but are instead targeting the devices themselves.