There are various ReBO approaches that leverage emerging technology to design reconfigurable elements. These approached utilize both emerging devices, such as STT and SOT for MRAM, as well as conventional CMOS to obfuscate the design. This chapter explores how these emerging technologies are used for obfuscation and discusses various solutions. Usually, the reconfigurable element, LUTs, is designed to store the bitstream with a hybrid of CMOS and emerging technologies. Another strategy involves combining switch boxes and LUTs as a hybrid technology. Implementing an STT device typically involves stacked multilayer sandwich structures, while integrating MTJs requires minimal die area apart from the CMOS circuits and contacts used to connect them to MOS transistors. This chapter also discusses various approaches and the design flow. We also present a solution that uses transistor configuration to obfuscate the circuit.