SAT_Jo: An Enhanced Lightweight Block Cipher for the Internet of Things

The utilization of resource constrained computing devices such as Radio-Frequency IDentification (RFID) tags, sensor nodes, industrial controllers and smart cards is very common today. The move from desktop computers to small devices made life stability to mobility and brings a wide range of security and privacy concerns. There come the cryptographic algorithms to ensure the security and privacy of the data and the users. Mostly, security of any cryptographic algorithms depends on the substitution boxes that are used in the round function. This paper proposes a new block cipher, SAT_Jo, which is suitable to the tag based applications of the Internet of Things (IoT). This paper computes a 4×4 S-box by the Galois field of order 2
⁴
. Permutation is explained as a bijective map from the set to itself. Sub key computation is carried out with a change in each phase. The encryption algorithm is explained with a mathematical illustration.