With an increasing risk of circuit piracy and intellectual property (IP), it is necessary to solve the problem of hardware security in digital signal processing (DSP) via hardware obfuscation. To obscure the circuit at a structural level, a high level of transformation techniques is used. High-level transformations (HLT) not only help in obfuscating the architecture of the circuit, it simultaneously meets the area-speed-power trade-offs. A key-based multiplexer design is proposed for the switch instance, which gives the desired output to the next node only if the configuration key is correct. A single bit change in the key will affect the whole functionality of the design. This key-based multiplexer helps to achieve functional obfuscation. As a result, two-level security is achieved. The objective of this paper is to prevent reverse engineering by structurally and functionally obfuscating the DSP circuit. Implemented and analyzed the area of the obfuscated 3-tap, 5-tap finite impulse response (FIR) filter, and obfuscated infinite impulse response (IIR) filter. Results are compared with those of the non-obfuscated filter circuit. Experimental results show that by applying the high level of transformations, the circuit gets obfuscated. Despite that, the area is reduced. The results confirm that the area of the obfuscated third-order IIR filter design is reduced by 24.56% as compared with its corresponding non-obfuscated filter.

随着电路盗版和知识产权（IP）风险的增加，有必要通过硬件混淆来解决数字信号处理（DSP）中的硬件安全问题。为了在结构层面上模糊电路，使用了高级别的转换技术。高级转换 (HLT) 不仅有助于混淆电路架构，而且同时满足面积-速度-功率权衡。为交换机实例提出了一种基于密钥的多路复用器设计，只有在配置密钥正确的情况下才将所需的输出提供给下一个节点。密钥中的单个位更改将影响设计的整个功能。这种基于密钥的多路复用器有助于实现功能混淆。结果，实现了两级安全性。本文的目的是通过在结构和功能上混淆 DSP 电路来防止逆向工程。实施并分析了模糊 3 抽头、5 抽头有限脉冲响应 (FIR) 滤波器和模糊无限脉冲响应 (IIR) 滤波器的面积。结果与非混淆滤波器电路的结果进行了比较。实验结果表明，通过应用高级转换，电路变得模糊。尽管如此，面积还是缩小了。结果证实，与相应的非混淆滤波器相比，混淆三阶 IIR 滤波器设计的面积减少了 24.56%。和模糊的无限脉冲响应 (IIR) 滤波器。结果与非混淆滤波器电路的结果进行了比较。实验结果表明，通过应用高级转换，电路变得模糊。尽管如此，面积还是缩小了。结果证实，与相应的非混淆滤波器相比，混淆三阶 IIR 滤波器设计的面积减少了 24.56%。和模糊的无限脉冲响应 (IIR) 滤波器。结果与非混淆滤波器电路的结果进行了比较。实验结果表明，通过应用高级转换，电路变得模糊。尽管如此，面积还是缩小了。结果证实，与相应的非混淆滤波器相比，混淆三阶 IIR 滤波器设计的面积减少了 24.56%。