关键词: 硬件木马检测, 红外图像增强, 自适应滤波, 引导滤波

Abstract: The trustable security design based on RO（Ring Oscillator） is an effective way to check whether the hardware Trojan is inserted. The reason is that the insertion of hardware Trojan will introduce low temperature areas and cause the RO thermal profile change. Considering the weak thermal signal of hardware Trojan, this paper proposes a detail enhancement method that utilizes both the time dimension and space dimension. Firstly, the adaptive filtering is used to reduce the noise in the time dimension. Next, the thermal map is sharpened by the detail enhancement method based on the guided filtering. The experimental results show that the SNR of processed thermal map is 20.1104 dB, which is 6.1421 dB more than that of original thermal maps, 3.5956 dB more than that of temporal de-noising only approach, and 3.6050 dB more than that of spatial detail enhancement only approach. The proposed approach performs better de-nosing effectiveness and richer details. The insertion of hardware Trojan can be detected through verifying the change of the low-temperature regions profiles.

Key words: hardware Trojan detection, thermal image enhancement, adaptive filtering, guided filtering