Implementation and Analysis of Feistel and SPN Structured Ciphers -CLEFIA and PRESENT

The investigation of interconnected devices, sensors, and various network-connected facilitates communication and information exchange. These devices are susceptible to security threats related to privacy and data exchange, especially considering the billions of inter-connected devices. Lightweight block ciphers offer a viable solution for power-constrained devices, including Radio-frequency identification (RFID) tags, ubiquitous computing, wireless sensor networks, aggregation networks, and the Internet of Things (IoT). This study implements two lightweight block ciphers, namely CLEFIA and PRESENT, both of which have FIESTEL and SPN structures respectively. Feistel structure has simple encryption and decryption algorithms and SPN is simple and easy to analyze. These ciphers are implemented using the Xilinx and Cadence tool. Implemented ciphers performance is evaluated in terms of power, area, and delay. Our findings demonstrate that PRESENT surpasses CLEFIA in terms of memory usage and security, while CLEFIA provides superior throughput compared to PRESENT.