A chaos-based block cipher with Feistel structure

In this paper, based on chaotic systems and balanced Feistel network structure, a symmetric block cipher with 256-bit secret key is proposed. The cipher operates on 64-bit plaintext blocks through 16 rounds computing. Within the kernel component of the cipher, i.e., round function F, a hyperchaotic system with four-wing attractors is used to improve the complicated and unpredictability of the ciphertexts. Furthermore, a chaos-based S-Box is adopted for generating the round subkeys. The numerical simulation results and security analysis has shown that the proposed cipher possess the desirable cryptographic properties and can be used in information security field.