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With the emergence of IoT (Internet of things), huge amounts of sensitivedata are being processed and transmitted everyday in edge devices with littleto no security. Due to their aggressive power management schemes, it is acommon and necessary technique to make a back-up of their program states andother necessary data in a non-volatile memory (NVM) before going to sleep orlow power mode. However, this memory is often left unprotected as adding robustsecurity measures tends to be expensive for these resource constrained systems.In this paper, we propose a lightweight security system for NVM during lowpower mode. This security architecture uses the memristor, an emergingnanoscale device which is used to build hardware security primitives like PUF(physical unclonable function) based encryption-decryption, true random numbergenerators (TRNG), and memory integrity checking. A reliability enhancementtechnique for this PUF is also proposed which shows how this system would workeven with less-than-100\% reliable PUF responses. Together, with all thesetechniques, we have established a dual layer security protocol (dataencryption+integrity check) which provides reasonable security to an embeddedprocessor while being very lightweight in terms of area, power, and computationtime. A complete system design is demonstrated with 65$n$m CMOS and emergingmemristive technology. With this, we have provided a detailed and accurateestimation of resource overhead. Analysis of the security of the whole systemis also provided.

A Secure Back-up and Restore for Resource-Constrained IoT based on Nanotechnology