利用堆积效应和间歇非线性滤波综合隐蔽难截获通信链路
Utilizing Pileup Effect and Intermittently Nonlinear Filtering in Synthesis of Covert and Hard-to-Intercept Communication Links
摘要：
我们概述了一种物理层隐写的方法，其中传输的低功率隐写消息在统计上与在相同谱带中观察到的信道噪声（例如热噪声）的高斯分量不可区分，因此信道噪声本身充当有效的覆盖信号。我们还演示了如何明显的频谱和时间特性的传输额外的，更高的功率覆盖信号（包括那些使用现有的通信协议）可以匹配的低功率隐写有效载荷和高斯噪声，提供额外的层混淆的覆盖和隐写消息。我们进一步说明了如何线性和非线性滤波的特定组合可以被用于有效分离的覆盖，有效载荷，和/或“友好干扰”信号，即使所有的传输具有基本上相同的频谱特性以及时间和幅度结构，并且当没有明确的差异，在频谱和/或时间分配的覆盖和隐写消息。
英文摘要：
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.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
