Security Architecture

For the purposes of this report, the internal security architecture (e.g., administrative control, user authentication, auditing) will not be considered. From an external security perspective, NAVSTAR has the following requirements:

1. Confidentiality of information on all links except satellite-user is required (the capability to secure the SV-user link must also be present, but is not generally used during peacetime).

2. Authentication of information on all links (e.g., source is as claimed) except SV-user required.

3. Data integrity (the ability to detect data altered enroute) is required on all links.

4. Resistance to externally-generated denial of service attacks is required.

5. Distribution of keying material over large physical distances must be considered.

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