AES 32: An FPGA implementation of Lightweight-AES for IoT Devices

Abstract

IoT is marked by the resource-constrained devices. Information security is the main challenge that arise due to wireless transmission of data by ubiquitous sensors. The rapid expansion of IoT setups with resource-constrained devices has spurred research into low-cost information security solutions. This study presents an efficient version of AES for high throughput. The AES's data path is 32-bit compressed. Implementation has been carried out on different FPGA families. Data path compression and use of BRAMs has led to improved throughput with savings in resource consumption. Loop-unrolled AES results in the consumption of 2669 slices which 12 times as big as this design. While 32-bit AES with 128-bit data path consumes 4 times more resources than proposed design which uses 223 slices and 5 BRAMs on Artix-7 FPGA. The proposed design delivers throughput in the range of 2.2 to 3.5 Gbps and achieves efficiency of 1.75 Mbps-7.8 Mbps per slice on different FPGAs. It outperforms different lightweight ciphers and constrained AES implementations in existing literature.