Reverse engineering (RE) has become a serious threat to the silicon industry. To overcome this threat, the ICs need to be made secure and non-obvious in order to find their functionality with their architecture. Real-time signal processing algorithms need to be faster and more reliable. Adding up additional circuits for increasing the security of the IC is not permittable due to increase in overhead of the IC. In this chapter, the authors introduce a few high-level transformations (HLT) that are used to make the circuit more reliable and secure against the reverse engineering without having overhead on the IC.