  To a large extent, the deployment of edge computing (EC) can reduce the
burden of the explosive growth of the Internet of things. As a powerful hub
between the Internet of things and cloud servers, edge devices make the
transmission of cloud to things no longer complicated. However, edge nodes are
faced with a series of problems, such as large number, a wide range of
distribution, and complex environment, the security of edge computing should
not be underestimated. Based on this, we propose a tactic to improve the safety
of edge computing by virtualizing edge nodes. In detail, first of all, we
propose a strategy of edge node partition, virtualize the edge nodes dealing
with different types of things into various virtual networks, which are
deployed between the edge nodes and the cloud server. Second, considering that
different information transmission has different security requirement, we
propose a security tactic based on security level measurement. Finally, through
simulation experiments, we compare with the existing advanced algorithms which
are committed to virtual network security, and prove that the model proposed in
this paper has definite progressiveness in enhancing the security of edge
computing.
