  Millions of devices are going to participate in 5G producing a huge space for
security threats. The 5G specification goals require rigid and robust security
protocol against such threats. Quantum cryptography is a recently emerged term
in which we test the robustness of security protocols against Quantum
computers. Therefore, in this paper, we propose a security protocol called
Quantum Key GRID for Authentication and Key Agreement (QKG-AKA) scheme for the
dynamic security association. This scheme is efficiently deployed in Long Term
Evolution (LTE) architecture without any significant modifications in the
underlying base system. The proposed QKG-AKA mechanism is analyzed for
robustness and proven safe against quantum computers. The simulation results
and performance analysis show drastic improvement regarding security and key
management over existing schemes.
