The new encryption algorithm for digital color image is proposed. The image can be encrypted through encryption matrixes generated with Logistic chaotic sequences to exclusive OR(XOR) color matrixes many times. The R, G and B components of the color image can be treated randomly and encrypted image becomes more uniform. Because the chaotic sequences are extremely sensitive to the parameters and the initial values, even ifthe encryption algorithm is open. Without the right key, the useful information can not be got. The encryption key length is effectively enlarged by using multiple sets of parameter of the branch and initial value as the encryption key. The experiments confirm its validity.%提出用Logistic混沌序列产生多个加密矩阵与基色矩阵进行多次异或的方法,对彩色图像的RGB分量进行随机化处理,使加密后的图像均匀.由于混沌序列对参数和初始值的极端敏感性,即使加密算法被公开,没有正确的密钥也无法得到有用信息.因此采用多组分支参数和初始值作为密钥,使密钥长度有效增加.实验结果证明了该算法是有效的.
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