The hardware security issues are emerging in crypto-algorithms of embedded portable Internet-of-Things-Devices (IoTD). The communication protocols/standards including MQTT (Message Queuing Telemetry Transport) are enforcing additional cares in device-to-system design perspectives. Due to computation-capacity limitations (CCLs) in battery-operated IoTD, heavy-duty crypto-algorithms are prohibited. This results in compromised hardware using lightweight algorithms. In this study, a new implementation schema for hierarchically-connected IoTD for indoor applications is proposed. This schema allows the IoT network to utilise strong-crypto-algorithms (i.e. RSA) instead of lightweight algorithms (i.e. attribute-based encryption (ABE)). Therefore, without increasing the consumption power or complexity, the security in the IoT network increases. This method brings about a new low CCL RSA with two-folded power-aware implementation. Furthermore, without complexity overhead, the proposed method is more secure than the conventional implementation due to the inherent countermeasure against the side-channel attacks. The presented schema is implemented on a target IoT network, utilising in XC7A100T-FPGA as IoT nodes. Furthermore, both the conventional and the proposed RSA-2048 have been implemented in Spartan6-LX75 on a SAKURA-GW board. The results show that the proposed method has reduced the RSA execution time and consumption power of IoTD at about 50 and 60%, respectively. The most noticeable drawback of the current implementation is an overhead in the range of 30-53% on block-random access memory (RAM) usage.
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