Reading convention

For certain recommendations, several architecture solutions of varying security levels are proposed. As such, readers can choose a solution that matches their security requirements. Furthermore, in an iterative approach to security, the various levels of security offered can be used to set an architecture target, and to identify the steps required to reach it. Recommendations are therefore presented in the following manner:

• Rx constitutes a state-of-the-art recommendation,

• Rx+ constitutes an alternative recommendation to Rx, of a higher security level. It is intended for entities with mature information system security,

• Rx- constitutes an alternative recommendation to Rx, of a lower security level.

Next to the recommendation number is an indication of whether the recommendation applies to SNS firewalls, the SMC server, or both (e.g., Rx | SNS-SMC).