The zero trust model enhances the security of the Internet of Things, but frequent identity verification affects user efficiency, especially the inconvenience caused by multi system switching, complex processes, and remote login. Moreover, multi-step authentication exacerbates learning costs. Keystroke dynamics, a biometric technology for analyzing typing habits, adapted to a zero trust framework, achieves low interference verification and improves user experience by continuously monitoring user behavior. This solution optimizes the authentication process without compromising security, reduces the burden of frequent verification, and is particularly beneficial for users who frequently travel and need to quickly switch devices, creating a smoother workflow.