Magnetic skyrmion has the potential to become one of the candidates for emerging technologies due to its ultra-high integration density and ultra-low energy. Skyrmion is a magnetic pattern created by transverse current injection in the ferromagnetic (FM) layer. A skyrmion can be generated by localized spin-polarized current and behaves like a stable pseudoparticle. Different logic gates have been proposed, where the presence or absence of a single skyrmion is represented as binary logic 1 or logic 0, respectively. In this paper, we propose novel camouflaged logic gate designs to prevent an adversary from extracting the original netlist. The proposal uses differential doping to block the propagation of the skyrmions to realize the camouflaged gates. To the best of our knowledge, we are the first to propose camouflaged skyrmion gates to prevent an adversary from performing reverse engineering. We demonstrate the functionality of different camouflaged gates using the mumax3 micromagnetic simulator. We have also evaluated the security of the proposed camouflaged designs using SAT attacks. We show that the same security from the traditional CMOS-based camouflaged circuits can be retained.

The rise of recycled integrated circuits (ICs) in the critical infrastructures causes a major concern to the government and industry because these chips exhibit lower performance and have shorter remaining useful life. The detection of these ICs becomes extremely challenging when they are in the supply chain. It is necessary to power up a chip at a distributor's site to measure different electrical parameters for verifying whether it is used before. However, this can be challenging, as many of the distributors may not be equipped with proper test infrastructures. Moreover, the reliability of authentic chips may be reduced if they have been removed from the packaging boxes for testing purposes. In this paper, we propose a robust and low-cost solution for enabling the traceability of an IC. The proposed solution builds a chain of trust among the manufacturer, distributors, and system integrator by enabling end-to-end traceability from manufacturing to system integration and provides protection against IC recycling. The proposed solution utilizes a small passive radio-frequency identification (RFID) tag, which needs to be placed on the package. Any entity in the supply chain can verify the authenticity of a chip using a commercial RFID reader.