Security Service Function Chain Deployment Using a Viterbi-Based Algorithm

Network Function virtualization (NFV) decouples network functions from hardware, improves the flexibility of resource allocation, and enhances network scalability. However, NFV also introduces several security threats since it relies on software, which makes attacking it or manipulating its services easier than having the network functions provided by hardware only. So security problem is a major concern for network operators and NFV users. This paper proposes a security and delay optimization service function chain (SFC) deployment method based on Viterbi algorithm. The proposed method considers the security demand level and transmission delay. Experiment results show that the proposed method not only has the best acceptance ratio, but also improves the virtual network function security level match degree and reduces the average transmission delay.