Issued by the Biden administration.
"While applicable to all audiences, this guidance specifically addresses “highly targeted” individuals who are in senior government or senior political positions and likely to possess information of interest to these threat actors. CISA is releasing this best practice guidance to promote protections for mobile communications from exploitation by PRC-affiliated and other malicious cyber threat actors."
"1. Use only end-to-end encrypted communications.
Adopt a free messaging application for secure communications that guarantees end-to-end encryption, such as Signal or similar apps."
Mobile Communications Best Practice Guidance
"While applicable to all audiences, this guidance specifically addresses “highly targeted” individuals who are in senior government or senior political positions and likely to possess information of interest to these threat actors. CISA is releasing this best practice guidance to promote protections for mobile communications from exploitation by PRC-affiliated and other malicious cyber threat actors."
"1. Use only end-to-end encrypted communications.
Adopt a free messaging application for secure communications that guarantees end-to-end encryption, such as Signal or similar apps."
Mobile Communications Best Practice Guidance