Design of Compact S Box for Resource Constrained Applications

The era of IoT has brought huge impact in the lives of people. It changed the way the people interact with the outside world and led to the development of many smart devices. The important factor to be considered in smart devices is security as the sensor nodes are prone to vulnerable attacks. To incorporate security in IoT lightweight block ciphers are preferred. Lightweight block ciphers can be tuned according to applications. This can be motivated by optimizing the S-box since S-box has significant impact on area. Reducing the area produces an impact on power, delay and memory. Here area optimized S-box of lightweight ciphers that serves for IoT devices is proposed. The S-box of PRESENT, GIFT and LED are optimized using karnaugh mapping. Further factorization is carried out to utilize the redundant terms which in turn reduces the gate count. The proposed method is found to be optimum when compared with previous works and it also consumes less area and power.