基于激光散斑子区域扫描的图像加密

摘要

提出一种将激光散斑子区域扫描应用于图像加密的方法。该方法从具有高度随机的激光散斑图像中提取多个子区域，使用SCAN语言将各子区域扫描为不同的随机序列，多组随机序列求和，取模形成新序列，并与待加密的原始图像进行按位异或实现加密。分析lena的加密效果、密钥空间、密钥敏感性与统计特性，证明了方法的可行性和安全性，而且散斑图像的不可预知性，降低了被破译的可能性。%An image encryption method based on laser speckle sub region is proposed. Many sub regions are extracted from random laser speckle images,and each sub region is scanned for different random sequences by using SCAN lan-guage. Multiple sequences are added,and their modules are calculated to form new sequences,which is made bit-wise exclusive or implement encryption with original images to be encrypted. It proves that the method is feasible and safe by analyzing encryption effect,key space,key sensitivity and statistical feature of Lena image. The unpredictability of the speckle image reduces the possibility of being decoded.