As cloud adoption, mobile devices, and remote work expand, traditional network perimeters no longer provide adequate protection. Outdated security models—like single-factor authentication and implicit trust— leave organizations vulnerable to evolving threats. Zero trust redefines security by assuming no user or device is inherently safe, requiring continuous verification everywhere. This e-book discusses considerations for establishing zero trust architectures in Linux® environments and how Red Hat® Enterprise Linux can help you protect your IT environment and organization