A lightweight blockcipher based on chaotic maps

Biometric data is non-renewable and irrevocable, so it is necessary to encrypt in the process of collection, storage and transmission to preserve its security. In this paper, a lightweight block cipher applied in the resource-limited environment is proposed by combining generalized Feistel network with chaotic maps. The cipher employs linear mixing transformations within encryption operation and adopts round keys from chaotic systems. Theoretical analysis and experimental results indicate that the cipher provides fast diffusion speed and high security.