A new stream cipher algorithm is designed based on two discrete chaotic dynamical systems.The algorithm uses the front output of the piecewise nonlinear map as the next input of the piecewise nonlinear map,and the iterative sequences are transformed into 0-1 sequence with discrete operator,and then,the 0-1 sequence is used to select the piecewise nonlinear maps of the two chaotic dynamical systems.The simulation test and security analysis are conducted to study the randomness, the initial value sensitivity and other properties of sequences generated by the map.The experimental results show that the algorithm has the characteristics of the high sensitivity of secret key,plaintext and ciphertext,and the small correlation between ciphertext and plaintext.These peculiarities can efficiently prevent ciphertext to leak the information of secret key and plaintext.%基于两个离散混沌动力系统提出了一种新的序列密码算法。该算法用分段非线性映射的上一次迭代的输出作为分段非线性映射的下一次迭代的输入，并将迭代序列通过离散化算子转化为0-1序列，由0-1序列来选择两个混沌动力系统中的分段非线性映射。对算法进行了仿真实验和安全性分析，并对该映射产生的序列的随机性、初始值敏感性及其他性质进行了研究。研究结果表明，算法呈现出密钥、明文与密文之间高度的敏感性，密文和明文之间的相关度极小等特点，从而起到有效防止密文对密钥和明文信息泄露的作用。
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