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软件定义网络(Software-defined Networking, SDN)是实现传统网络体系中的应用层、控制层和数据层解耦的一种新型网络架构。本文研究该网络环境下的隐蔽通信问题，基于OpenFlow控制器与交换机之间的交互特性，提出一种基于响应报文次序组合调制的多流时间式隐信道设计方案，该方案利用控制器与多交换机之间的链路层发现协议(Link Layer Discovery Protocol, LLDP)响应报文到达的次序分布构建组合累计分布函数并调制秘密信息。仿真实验结果表明所提方案具有较好的隐蔽性和鲁棒性。
Software-defined Networking (SDN) is a new type of network architecture that decouples the application layer, control layer and data layer from the traditional network architecture. Based on the interaction between OpenFlow controller and switch, this paper presents a scheme of multi-stream time-based hidden channel design based on combined response packet sequence modulation. This scheme uses the controller and multi Link Layer Discovery Protocol (Link Layer Discovery Protocol, LLDP) Response Packet Arrival Sequence Distribution Constructs a combined cumulative distribution function and modulates the secret information. Simulation results show that the proposed scheme has better concealment and robustness.