Abstract: This paper discusses on image encryption based on three dimension Rössler system，which not only rotates the position of pixels but also exchanges the pairs of pixels depending on any two dimensions of Rössler chaotic sequences，and changes the gray value of pixel depending on the third dimension of Rössler chaotic sequences.The algorithm has Rössler key and scrambling key，which increases keys space and makes keys’ management more convenient.The algorithm provides good security，high encryption efficiency，and can be easily used in image encryption.Compared with space domain compound method realized by Chebyshev mapping，the algorithm is faster in encryption and has larger keys space.

摘要： 基于Rössler系统的三维混沌序列设计了一种既改变像素位置又改变像素灰度值的图像加密方法。使用Rössler三维混沌序列中的任意两维混沌序列控制像素的旋转与置换，剩下的一维序列变换像素的灰度。并且在Rössler混沌加密密钥的基础上，增加了置乱密钥，提升了密钥空间，方便了密钥管理。对比Chebyshev映射实现的空域复合加密方法，仿真实验表明该加密方案加密时间短、效率高、安全性好且易于实现。