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Due to the expectedly higher density of mobile devices and exhaust of radioresources, the fifth generation (5G) mobile networks introduce small cellconcept in the radio access technologies, so-called Small Cell Networks (SCNs),to improve radio spectrum utilization. However, this increases the chance ofhandover due to smaller coverage of a micro base station, i.e., home eNodeB(HeNB) in 5G. Subsequently, the latency will increase as the costs ofauthenticated key exchange protocol, which ensures entity authentication andcommunication confidentiality for secure handover, also increase totally. Thus,this work presents a secure region-based handover scheme (ReHand) with useranonymity and fast revocation for SCNs in 5G. ReHand greatly reduces thecommunication costs when UEs roam between small cells within the region of amacro base station, i.e., eNB in 5G, and the computation costs due to theemployment of symmetry-based cryptographic operations. Compared to the threeelaborated related works, ReHand dramatically reduces the costs from 82.92% to99.99%. Nevertheless, this work demonstrates the security of ReHand bytheoretically formal proofs.

ReHand: Secure Region-based Fast Handover with User Anonymity for Small Cell Networks in 5G