一种基于Web通信行为的抗审查隐蔽通信协议

A censorship-resistant covert communication protocol based on Web communication behavior

以往基于TCP/IP协议或HTTP协议的隐蔽通信方式通常是利用协议本身各个字段的特点,将信息隐藏在协议的各个字段中.这种方式往往会具有某种结构特征,而基于计时的隐蔽通信又往往具有某种流模式.基于非对称通信理论和马尔科夫模型的Web行为预测,提出一种基于Web通信行为的抗流量审查隐蔽通信协议.重点描述隐蔽通信协议和原型系统,并分析协议的安全性.测试结果表明,该方法具有很高的效率和安全性.

The existing covert communication method based on TCP/IP or HTTP often utilizes characteristics of protocol and hides extra data in specific fields of protocol header.Such a method leaves some obvious signatures.However,timing-based covert communications have some kind of traffic pattern.We propose a censorship-resistant covert communication protocol based on Web communication behavior,which combines dynamic asymmetric communication and Markov model-based Web usage prediction.In this paper we focus on covert communication protocol,prototype system,and security of the protocol.The test results show that our method has high performance and safety.