Chaos-based S-box for lightweight block cipher

In this paper, design of chaos-based 4 × 4-bit substitution box (S-box) is presented. The chaotic 4 × 4-bit S-box provides good cryptographic properties and has hardware efficiency. The proposed chaotic 4×4-bit S-box is used for design of chaotic S-boxes chaining layer, which offers a highly secure level. The result of implementation shows that the proposed chaotic 4×4-bit S-box is suitable for the lightweight block cipher due to low resource utilization.