Zero trust security is a security framework that assumes all users, devices, and networks are potential threats. It requires strict identity verification and access control for every device trying to access a network or resource. In a nutshell, no one is trusted by default, and everyone must prove their identity and authorization before being granted access.
Zero trust security is a paradigm shift from traditional network security models that relied on implicit trust. In traditional models, users and devices within a network were implicitly trusted once they had gained access, allowing them to move freely within the network and access resources without further authentication. However, zero trust security eliminates this implicit trust, and every access attempt is treated as a potential threat until proven otherwise.