Software and networking industry is experiencing a rapid development and deployment of network function visualization (NFV) technology, in both enterprise networks and cloud data center networks. One of the major reasons for such a technological trend is that NFV has the capability of reducing capital and operational expenditures, thereby increasing networking service efficiency, performance, agility, scalability and resource utilization. Despite such well-recognized benefits, security remains to be one of the major concerns of network service providers that seriously impede the further development and deployment of NFV
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