Interpretation

For some recommendations, several architecture solutions of varying security levels are suggested. Readers can as such choose the solution best suited to their security requirements. In addition, as part of an iterative approach to security, the different levels of security suggested can be used to set an architecture target and identify the steps required to achieve it. Recommendations are therefore presented in the following manner:

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

• Rx+ constitutes an alternative recommendation to an Rx recommendation, with a higher security level. This level is intended for entities with experience in information system security,

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

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