A Novel Lightweight Block Encryption Algorithm Based on Combined Chaotic System

Due to the high complexity of traditional block cipher, which is not suitable for resource constrained devices such as wireless sensors. Therefore, this paper proposes a novel lightweight block encryption algorithm based on combined chaotic system. Firstly, a novel combined chaotic system with good pseudo-random characteristics is proposed to construct S-boxes with high security and p-boxes with excellent diffusion performance. Secondly, a novel lightweight encryption and decryption structure are designed based on Feistel encryption structure, which reduces the computational complexity and memory consumption of the encryption and decryption process, and the designed round function can use different lengths of block and key, which means the structure has excellent scalability. The software and hardware implementation test and security test results show that the proposed lightweight block encryption algorithm based on combined chaotic system (LBCCS) provides an efficient and secure encryption way for the resource constrained devices.