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Network slicing in 5G is expected to essentially change the way in which network operators deploy and manage vertical services with different performance requirements. Efficient and secure slice provisioning algorithms are important since network slices share the limited resources of the physical network. In this article, we first analyze the security issues in network slicing and formulate an Integer Linear Programming (ILP) model for secure 5G core network slice provisioning. Then, we propose a heuristic 5G core network slice provisioning algorithm called VIKOR-CNSP based on VIKOR, which is a multi-criteria decision making (MCDM) method. In the slice node provisioning stage, the node importance is ranked with the VIKOR approach by considering the node resource and topology attributes. The slice nodes are then provisioned according to the ranking results. In the slice link provisioning stage, the k shortest path algorithm is implemented to obtain the candidate physical paths for the slice link, and a strategy for selecting a candidate physical path is proposed to increase the slice acceptance ratio. The strategy first calculates the path factor P f which is the product of the maximum link bandwidth utilization of the candidate physical path and its hop-count, and then chooses the candidate physical path with the smallest P f to host the slice link. Extensive simulations show that the proposed algorithm can achieve the highest slice acceptance ratio and the largest provisioning revenue-to-cost ratio, satisfying the security constraints of 5G core network slice requests. INDEX TERMS 5G core network slice, network slicing, slice provisioning, slice security, VIKOR approach. I. INTRODUCTION With the emergence of new application scenarios, such as Augmented Reality (AR), Industrial Internet of Things (IIoT), and Vehicle-to-Everything (V2X), 5G networks have very diverse communication requirements, including high throughput, ultra-low latency, and ultra-reliability. Table 1 lists the three main application scenarios and corresponding communication requirements in 5G networks defined by the IMT-2020 Focus Group in the Telecommunication Standardization Sector of the International Telecommunications Union (ITU-T) [1]. The one-size-fits-all architecture of traditional mobile networks is unable to meet the myriad service requirements of the 5G networks. In addition, due to the current distributed and heterogeneous network architecture, The associate editor coordinating the review of this manuscript and approving it for publication was Thanh Ngoc Dinh .

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