中文摘要：

针对DES（数据加密标准）算法所存在的不足和混沌序列的特点,提出了一种新的基于Lorenz混沌模型的改进DES加密算法,并在C8051F020单片机上进行了实现。该算法将混沌模型与DES算法相结合,对加密时所用的初始密钥和16轮迭代过程进行了改进,采用一次一密的加密方法。理论分析和实验结果表明,与原始DES算法相比,该算法扩展了密钥的选择空间,有效地提高了算法的安全性能和抵抗攻击的能力,并提高了算法的运算速度。

英文摘要：

In view of the deficiency in DES（Data Encryption Standard） algorithm and the characteristics of chaotic sequences,this paper presents a new improved DES encryption algorithm based on Lorenz chaotic model,and then it＇s realized on the C8051F020 microcontroller.The scheme combines chaos sequence with DES algorithm to improve the initial keys of encryption and sixteen times iteration procedures,and it uses one-time password encryption method.Theoretical analysis and experimental results show that the algorithm is able to extend the key space compared with the original DES algorithm,also it has a higher speed of operation and improves the property of algorithm＇s security as well as the anit-attack ability effectively.