中文摘要：

为了克服传统的加密方法以及采用低维混沌系统进行图像加密中小密钥空间的缺点，获得更好的加密效果，采用空间混沌对图像进行加密和解密，采用空间猫图置乱像素的位置，用另外一个空间混沌系统混乱原始图像与加密图像之间的关系，从而实现非常好的加密效果；通过实验和与采用低维混沌进行加密的方法相比较，结果说明用空间混沌进行图像加密有更好的安全性。

英文摘要：

In order tO overcome the drawbacks of small key space and weak security in the lower dimensional chaotic cryptosystems in traditional encryption methods, to achieve highly secure image encryption techniques, this paper employs spatial chaotic systems to encrypt and decrypt images and use spatial Cat map to shuffle the position of image pixels and use another spatial chaotic map to confuse the relationship between the cipher-image and the plainimage. Through experimental tests and comparison with encryption techniques using lower dimensional chaotic systems, the results demonstrate the high superiority using spatial chaotic maps for image-encryption.