论文标题
利用堆积效果和间歇性非线性滤波在秘密和难以触及的通信链接中
Utilizing Pileup Effect and Intermittently Nonlinear Filtering in Synthesis of Covert and Hard-to-Intercept Communication Links
论文作者
论文摘要
我们概述了一种物理层隐志的方法，在该方法上，传输的低功耗史坦格消息在统计学上与在同一频谱带中观察到的通道噪声的高斯组件（例如热噪声）无法区分，因此通道噪声本身是有效的覆盖信号。我们还展示了如何制作传输额外的更高功率覆盖信号（包括使用现有通信协议的频谱和时间特性），以匹配低功率的Stego有效载荷和高斯噪声的噪声，从而为封面和Stepego消息提供了额外的混淆层。我们进一步说明了线性和非线性过滤的特定组合如何用于有效分离封面，有效载荷和/或“友好卡住”信号，即使所有传输基本上具有相同的光谱特征以及时间和振幅结构，以及何时在光谱和/或时间上没有明显的差异，以供封面和封面和时间范围内差异。
We outline an approach to physical-layer steganography where the transmitted low-power stego messages are statistically indistinguishable from the Gaussian component of the channel noise (e.g. the thermal noise) observed in the same spectral band, and thus the channel noise itself serves as an effective cover signal. We also demonstrate how the apparent spectral and temporal properties of transmitted additional, higher-power cover signals (including those using the existing communication protocols) can be made to match those of the low-power stego payload and the Gaussian noise, providing extra layers of obfuscation for both the cover and the stego messages. We further illustrate how a specific combination of linear and nonlinear filtering can be used for effective separation of the cover, payload, and/or "friendly jamming" signals even when all transmissions have essentially the same spectral characteristics as well as temporal and amplitude structures, and when there are no explicit differences in the spectral and/or temporal allocations for the cover and the stego messages.
