Research On Covert Communication Based On Complete End Hopping And Spreading

In recent years,with the rapid development of information technology,network transmission brings us convenience,at the same time,information security problems emerge in endlessly.As an important secure communication tool,covert channel is one of the important means to ensure the safe transmission of network information.However,with the gradual diversification and complexity of network attack means and the continuous updating of various targeted detection technologies,covert channel technology is facing great challenges,which can not meet the security needs of covert communication at this stage.Therefore,in this situation,how to achieve effective and secure covert communication on the basis of active network defense is one of the key problems in this field.Aiming at the weak defense capability of both sides in the network covert channel,this paper takes the end information expansion flow as the carrier,and uses the time attribute of the data packet to propose a covert communication model based on complete end hopping and spreading.The high-intensity defense covert channel is realized by combining the complete end hopping and spreading technology with the covert timing channel;aiming at the problem that the time interval of covert timing channel is regular and the covert is poor,we propose an additive time replay covert channel(A-TRCTC),by controlling the sum of m adjacent packets,it can be mapped into different binary codes,thus realizing a high concealment covert channel;aiming at the problem of low robustness of timing covert channel,polarization code is used to channel creatively coding,so as to reduce the BER of the system,improve the communication quality,and achieve high robustness and high reliability of communication.Firstly,this paper briefly describes the basic contents of end hopping and spreading,covert channel and its coding in the covert communication system based on complete end hopping and spreading.Secondly,the paper designs a covert communication model of complete end hopping and spreading,defines the complete end hopping and spreading,and describes the key technology and feasibility of the model.Finally,the paper verifies the availability and security of the model through experiments,and the experimental results show that the system can effectively achieve the security under active network defense covert communication.