Abstract: This paper proposes a new image encryption approach based on chaotic map pattern.By the idea of SCAN pattern the paper takes the left map and right map of five chaotic maps as ten patterns.Those patterns can be used in image encryption.Here the types of the patterns are used as the keys.Simulation shows that the image encryption approach has fast encryption speed and high security.The approach solves the limit between the keys and the size of image when encrypting image by chaotic map.At the same time it also solves the limit of the size of image required by SCAN pattern.It is a promising encryption technology.

Key words: information security, image encryption, chaos, chaotic map

摘要： 混沌映射加密图像时，通常对秘钥有限制。提出一种新的混沌映射模式加密算法。利用SCAN语言的思想，将五种映射的左右映射，看作十种加密模式。使用不同模式对方图进行加密，其中模式类型作为秘钥，密钥设计非常灵活。仿真表明，采用混沌映射模式加密图像，加密速度非常快，安全性高，是一种有前途的加密技术。

关键词: 信息安全, 图像加密, 混沌, 混沌映射