https://www.bleepingcomputer.com/news/security/nsa-microsoft-promote-a-zero-trust-approach-to-cybersecurity/

The National Security Agency (NSA) and Microsoft are advocating for the Zero Trust security model as a more efficient way for enterprises to defend against today’s increasingly sophisticated threats.

The concept has been around for a while and centers on the assumption that an intruder may already be on the network, so local devices and connections should never be trusted implicitly and verification is always necessary.