Zero Trust is not just a simple security solution. 

This approach challenges the traditional perimeter-based security model, which defended the boundary between the 'secure' internal network and the 'insecure' external network.

As digital transformation accelerates and organizations adopt cloud and mobile workforces, the old security perimeter has dismantled, increasing new vulnerabilities and attack surfaces. 

Zero Trust is a fundamentally different approach that considers every access attempt a potential threat and continuously verifies them. It verifies all users and devices to prevent unauthorized access and restricts lateral movement within the network. This requires a fundamental shift in organizational culture beyond technical changes.

In the Zero Trust model, trust varies by location. It requires implementing dynamic, context-based policies that evaluate each network access request by analyzing user ID, devices, and other behaviors. 

The biggest challenge the Chief Information Security Officer (CISO) faces is balancing security with usability. 

Every access must be questioned and verified, but this process should not hinder the work efficiency of employees. 

A delicate balance is needed to apply the principle of least privilege without disrupting workflow.