信息安全是一永恒的话题。当人们在不安全的网络上传播重要的信息时，如何防止 泄漏信息成为至关重要的问题。事实上，混沌系统具有的混乱属性与加密学的混乱、扩 散、伪随机存在非常高的相似性。基于混沌系统来研究安全、高效的加密算法成为目前 一个重要研究领域。混沌系统独有的密码学特性,使其非常适合于信息加密。基于混沌系 统设计的加密算法的安全性很大程度上取决于其采用的混沌系统的性能，如何设计出更 好的混沌系统用来加密也成为当前的一个研究热点。设计新混沌系统极其困难，尽管高 维系统结构更加复杂，具备高Lyapunov 指数，用来产生混沌序列进行加密可以获得更 高的安全性，但是不容易实现，且计算量大。而一维系统具备结构简单，实现容易的特 点。现有的一维与高维混沌系统都存在混沌区间不连续、参数范围小、混沌序列分布不 均匀的问题。如何通过有效的方法，对现有的混沌系统进行改进，使其能更加适合于数 字图像加密应用。针对上面的这些问题，通过对现有的一维混沌系统进行适当的组合， 获得了一新一维混沌系统，其具备高Lyapunov 指数、混沌范围广、混沌区间连续、混 沌序列分布均匀和可控参数多的特点。文中通过绘制分岔图、Lyapunov 指数图对比研究 了新混沌系统的性能。基于此新混沌系统设计了对应的图像加解密算法。最后，基于 Matlab 软件，并采用多种指标验证了设计算法的加密效果和抗攻击性能。通过仿真结果 可以看出，基于提出的新一维混沌系统设计的图像加密算法具备更好的安全性，且其实 现容易。同时设计了可用于对字符串/文件加解密算法，基于VC6.0 采用C 语言验证了 算法正确性。最后利用可编程逻辑器件开发平台，验证了提出的图像加密算法的可行性。

Information security is an eternal topic. When people spread important information through an insecure network, how to prevent the leakage of information has been becoming a critical issue. In fact, chaos property of chaotic system is similar to confusion, diffusion and pseudo-random property of cryptography. Research on the safety and efficient encryption algorithms based on chaotic system become an important research area. Chaotic has unique cryptographic feature that makes it’s suit for encryption.The security of chaotic systems based on encryption algorithm largely depends on the performance of the chaotic system, how to design a better chaos system to encrypt also become a hot topic. It’s extremely difficult to design new chaotic system, although the high-dimensional system’s structure is more complex, and it owns high Lyapunov exponent for the chaotic sequence encryption, which can achieve higher security, but it’s difficult to implement and it’s computation is large. The structure of one-dimensional systems is simple,it’s also easy to implement.The existing one-dimensional and high-dimensional chaos system have the following problem,such as discrete intervals, small parameter range and uneven distribution of chaotic sequence. How can we use effective method to improve the existing chaotic system to make it to be more suitable for digital image encryption applications. Aiming at the above issues, a new one-dimensional chaotic system is approsed through combining the existing one-dimensional chaotic systems appropriately, its Lyapunov exponent is high, chaos range is wide, chaos section is continuous, chaotic sequence distribute uniformity and it has more control parameters. This paper studied the performance of the new chaos system by comparing bifurcation diagram and Lyapunov exponent diagram. It proposed a new decryption algorithms based on this new chaotic system. Finally, it verified the effection of encryption algorithms and anti-attack capability through Matlab software. The results show that the new image encryption algorithm based on one-dimension chaotic system has better security, and its easy to implement. Meanwhile it proposed a encryption and decryption algorithms used for string and file, it is verified by VC6.0 using C language. Finally, the image encryption algorithm is proved by developmentplatform made by programmable logic device