A Fast and Efficient 191-bit Elliptic Curve Cryptographic Processor Using a Hybrid Karatsuba Multiplier for IoT Applications

The most widely used asymmetric cipher is ECC. It can be applied to IoT applications to offer various security services. However, a wide range of sectors have been investigated for applying ECC. The field of elliptic curve cryptographic processors for GF (2191) has received less attention. This study presents a low-resource, high-efficiency architecture for a 191-bit ECC processor. This design uses a novel hybrid Karatsuba multiplier for the multiplication of finite fields. For GF (2191), the Quad-Itoh-Tsuji algorithm has been altered to provide a small-size inversion unit. PlanAhead software synthesizes the CPU, which is then implemented on several Xilinx FPGAs. With savings in slice consumption ranging from 16 to 43 percent, the implemented design is the most restricted compared to the current designs. Compared to previously published designs, it is 3.8–1000 times faster. The elliptic curve scalar multiplication on the Virtex-7 FPGA is computed in $7.24~\mu $ s. Additionally, the proposed design achieves savings in area-time products of 77 to 90 percent. It may be beneficial for IoT edge devices. It utilizes 3120 mW of power for the operation. A state-of-the-art comparison based on the figure of merit (FoM) reveals that the proposed design outclasses the newest designs by a large margin. It also exhibits a throughput of 138.121 Kbps.