为了提高图像在信息交换中的安全性与可靠性, 提出一种将激光散斑和Henon映射混合应用于图像加密的新方法。激光散斑图像灰度分布具有随机性, 采用SCAN 语言将其扫描为不同的随机序列, 该序列与Henon映射生成的序列求和形成新序列, 新序列与待加密的原始图像按位异或实现加密。结果表明: 该方法具有较好的加密效果, 较强的密钥敏感性, 较弱的相邻像素相关性, 可抵御统计分析攻击。

In order to improve the security and reliability of the image in the information exchange, a new method was put forwards that laser speckle and Henon mapping were mixed and applied to the image encryption in this paper. Laser speckle image gray distribution was random, it could be scanned for difference random sequences by using the SCAN language. A sequence generated by this sequence with Henon mapping that sum modulo form a new sequence. Using the new sequence to made bit-wise exclusive or implement encryption with original images to be encrypted. The results showed that the method has a good encryption effect, strong key sensitivity and weak correlation of adjacent pixels, could against the statistical attack.