传统安全通信系统分别设计信道编码、密码算法等模块,系统安全性几乎不受信道误码影响。借鉴物理层加密的概念,该文提出一种系统化设计方法,利用信道误码进一步提高系统安全性。提出对该系统进行安全性定量评估的方法,分别计算码字相关性和信道误码对安全性的影响,为研究该类系统提供了新的技术途径。理论和仿真结果表明:当二进制对称信道(BSC)的比特翻转概率大于阈值时,所设计的基于分组密码的物理层加密通信系统具有高于传统安全通信系统的安全性。 The traditional secure communication system designs the module of channel coding and password algorithm, respectively, and the system security is hardly affected by the channel error code. Drawing on the concept of physical layer encryption, this paper proposes a systematic design approach that uses channel error codes to further improve system security. The method of quantitatively assessing the security of the system is proposed. The influence of codeword correlation and channel error code on security are calculated separately, which provides a new technical approach for the study of this kind of system. The theoretical and simulation results show that when the bit-flip probability of binary symmetric channel (BSC) is greater than the threshold, the packet-cipher-based physical layer encryption communication system designed has higher security than the traditional secure communication system.