Abstract
For the law enforcement agencies, lawful interception is still one of the main means to intercept a suspect or address most illegal actions. Due to its centralized management, however, it is easy to implement in traditional networks, but the cost is high. In view of this restriction, this paper aims to exploit software-defined network (SDN) technology to contribute to the next generation of intelligent lawful interception technology, i.e., to optimize the deployment of intercept access points (IAPs) in hybrid software-defined networks where both SDN nodes and non-SDN nodes exist simultaneously. In order to deploy IAPs, this paper puts forward an improved equal-cost multi-path shortest path algorithm and accordingly proposes three SDN interception models: T interception model, ECMP-T interception model and Fermat-point interception model. Considering the location relevance of all intercepted targets and the operation and maintenance cost of operators from the global perspective, by the way, we further propose a restrictive minimum vertex cover algorithm (RMVCA) in hybrid SDN. Implementing different SDN interception algorithms based RMVCA in real-world topologies, we can reasonably deploy the best intercept access point and intercept the whole hybrid SDN with the least SDN nodes, as well as significantly optimize the deployment efficiency of IAPs and improve the intercept link coverage in hybrid SDN, contributing to the implementation of lawful interception.
Highlights
National security and social stability, in today’s world, have been shaken by some security threats such as terrorist attacks, cybercrime and information warfare
We develop an improved equal-cost multi-path shortest path algorithm (i.e., ECMP-Dijkstra) which can find all shortest paths between the source (S) and the destination (D), and put forward three software-defined networking (SDN) interception models based on ECMP-Dijkstra Algorithm in hybrid SDN
Under different proportion of SDN nodes, we will study and analyze the influence of different SDN interception models on the best transmission quality of intercepted data (the minimum cost from intercept access point (I) to the interception center (L); MILC), the total cost of running intercept operation in global network (TOC), and the quality of service of normal user’s data stream (UQoS), the deployment efficiency of intercept access points (IAPs)), and the total number of failures to deploy IEP (i.e., NFD)
Summary
National security and social stability, in today’s world, have been shaken by some security threats such as terrorist attacks, cybercrime and information warfare. Lawful interception is a kind of data acquisition of communication network based on lawful authorization for the purpose of analysis or evidence collection. It allows the law enforcement agencies with court orders or other legitimate authorities to selectively eavesdrop on individual users. Most countries require those licensed telecom operators to provide legitimate interception gateways and nodes on their networks for communication interception. To deploy the gateways and nodes in legacy networking where traditional gateways or nodes rely on dedicated devices and backhaul links to intercept network traffic, leads to unimaginable cost. Software-defined networking (SDN) [1], different from the traditional networking, can simplify the traditional network’
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