The scope of this document is to outline cellular network operator requirements on basic principles for Core network security archetecture and to provide security requirements for core network elements. A central concept introduced in this specification is the notion of a security domain. The security domains are networks that are managed by a single administrative authority. Within a security domain the same level of security and usage of security services will be typical. Typically, security domains are identified by resources that are required access various network elements. These resources are then segrerated in to 'Security Zones' enforced by access control lists, authentication, firewall rules, operating systems or Network Elements (NEs) and security protocols.
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