A Hybrid Chaotic Encryption ASIC With Dynamic Precision for Internet of Things

With the rapid development of the Internet of Things (IoT), device and data security has attracted huge academic attention in recent years since conventional security methods are barely feasible in IoT circumstances. Traditional encryption methods require extensive computation complexity, which requires several hardware resources and power consumption. Meanwhile, due to the low-power requirement, most IoT devices are lightweight with limited computing and storage capabilities. The dilemma leads to the need for a lightweight encryption method with decent data protection strength. Chaotic encryption can be applied in the IoT because of the characteristics of determinacy and strong randomness. However, its safety and hardware overhead are positively correlated with implementation precision. Therefore, this article performs a quantitative analysis of the system under different precision conditions. Then, a hybrid chaotic encryption scheme with dynamic precision is proposed, which balances power consumption and security protection level. Finally, the proposed design is implemented by Verilog and synthesized using SMIC 65-nm CMOS technology. The evaluation results proved that the proposed ASIC provides decent encryption strength under diverse precision, effectively overcoming the influence of limited precision with low-hardware resources and power consumption.