Cryptanalysis and Improvement on a Block Encryption Algorithm Based on Dynamic Sequences of Multiple Chaotic Systems

Recently, a block encryption scheme based on dynamic sequences generated by multiple chaotic systems has been proposed. This paper points out some defects of the scheme and its related security problems. Furthermore, the paper gives out the details of a chosen plaintext attack and verifies it through experiments. The result of experiment shows that the encryption scheme cannot resist the chosen plaintext attack. Finally, the paper proposed an improved measure to make up the weakness of the scheme.