Abstract
The major constraints of wireless sensor nodes are computational costs, communication power and size. Different from wired networks, any adversary can receive and transmit fabricated data. Hence, important messages through the public channel should be encrypted. To provide data security over WSN, standard AES is too bulky for WSN. In this work, we proposed a variant of AES which is suitable for WSN by choosing different parameters for Mix Columns to achieve higher data diffusion rate. Sub Bytes and Mix Columns transformations are combined into a look-up table, which reduces 512 bytes space in total. In addition, we implement Inv Sub Bytes and Sub Word with composite field calculation by using GF(2/sup 4/)/sup 2/ inverter. Our throughput can reach 1.6 Gps using FPGA simulation, and is suitable for WSN transmission.