Today, CISA released Mobile Communications Best Practice Guidance. The guidance was crafted in response to identified cyber espionage activity by People’s Republic of China (PRC) government-affiliated threat actors targeting commercial telecommunications infrastructure, specifically addressing “highly targeted” individuals who are in senior government or senior political positions and likely to possess information of interest to these threat actors.

Highly targeted individuals should assume that all communications between mobile devices—including government and personal devices—and internet services are at risk of interception or manipulation.

CISA strongly urges highly targeted individuals to immediately review and apply the best practices provided in the guidance to protect mobile communications, including consistent use of end-to-end encryption.