5G networks are anticipated to be commercially deployed worldwide for establishing a massively connected society in the year 2020. To enable a user to securely access to network is a vital prerequisite to operate a 5G network. Recent research results have uncovered a number of security vulnerabilities when a user gains access to 3G or 4G networks, e.g. leakage of long-term key, privacy of subscriber identifier, insecurity of links between mobile network operators, linkability attacks. Such weaknesses should be mitigated in the 5G network. In this paper, we present a novel scheme used for 5G attach procedure to address these issues without relying on a global public key infrastructure. The significant advantage of the proposed scheme over existing solutions is that all security issues around the attach procedure can be addressed in one scheme without relying on a PKI.
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