What is the most secure ISSG configuration for four benefits-related ISUs?

The most secure configuration for benefits-related Integration System Groups (ISGs) involves assigning one individual ISSG for each individual Integrated Service Unit (ISU). This approach enhances security by ensuring that each ISU operates within its own isolated environment, minimizing the risk of data breaches or unauthorized access. By having separate ISSGs, sensitive information pertaining to each benefit is compartmentalized, limiting the exposure of data to only those applications or users that require access to that specific ISU.

Furthermore, this individual approach also simplifies compliance with security regulations and policies, as it allows for tailored security measures to be implemented for each ISU. As a result, if one ISU is compromised, the impact is contained, protecting the other ISUs from potential threats.

In contrast, configurations that involve multiple ISGs sharing a single ISSG or a single ISSG for all ISUs can lead to increased vulnerabilities, as they create potential access points for unauthorized users to breach the system. Custom ISSG configurations, while somewhat flexible and potentially useful, may not provide the same level of enhanced security and isolation as having separate ISSGs for each individual ISU.