关键词: 混沌密码, 序列密码, Logistic映射, Chebyshev映射, 线性反馈移位寄存器, 加密算法

Abstract: A chaotic stream cipher was designed by utilizing feed forward model. The sequence generated by Linear Feedback Shift Register (LFSR) was used as the initialization sequence. Logistic map and Chebyshev map were used as filtering functions. Furthermore, the chaotic stream cipher also included compression transformation, S-box transformation used in SMS4 algorithm, memory transformation and swap transformation. The results of analysis and experiment prove that the proposed stream cipher owns sufficient safety and higher encryption speed.

Key words: chaotic cipher, stream cipher, Logistic map, Chebyshev map, Linear Feedback Shift Register (LFSR), encryption algorithm