The broadcast nature of wireless communication makes it intrinsically vulnerable to eavesdropping attacks. This article suggests the using of secret spreading codes (i.e. only a legitimate receiver knows the spreading sequence) and artificial interference (i.e. by intentionally adding noise to the broadcast channel) on countering eavesdropping attacks. We have made a theoretical analysis on the potential performance degradation at the eavesdropper and at the legitimate receiver for a point-to-point wireless communication system using direct-sequence spread spectrum (DSSS) with coherent phase-shift keying (PSK) modulation. We have also proposed a lightweight non-cryptographic secret code generation scheme which leads to low correlation between the spreading codes used at the transmitter and at the eavesdropper. Simulation results confirms the good anti-eavesdropping performance on using the proposed non-cryptographic secret code generation scheme. Simulation results also conform with the theoretical analysis and motivate the using of artificial interference on countering eavesdropping attacks.

无线通信的广播性质使其本质上容易受到窃听攻击。本文建议使用秘密扩展码（即，只有合法的接收者才能知道扩展序列）和人为干扰（即，通过有意向广播信道添加噪声）来对抗窃听攻击。我们已经对使用直接序列扩频（DSSS）和相干相移键控（PSK）调制的点对点无线通信系统在窃听者和合法接收者处的潜在性能下降进行了理论分析。我们还提出了一种轻量级的非加密秘密代码生成方案，该方案导致在发射机和窃听者处使用的扩展代码之间的相关性较低。仿真结果证实了使用所提出的非密码秘密密码生成方案具有良好的防窃听性能。仿真结果也与理论分析相吻合，并激发了人为干扰手段对付窃听攻击。