用多重菲涅耳衍射变换和相位密码板实现图像加密的技术

基于多重菲涅耳衍射变换和相位密码板,设计了一种新的图像加密计算方法.待加密的明文图像在多重离散菲涅耳衍射变换和相位密码板的共同作用下,变换为一个具有随机码特征的密文矩阵;衍射距离和相位密码板是主要的密钥.只有当所有密钥都正确时,才能成功地解密密文.结果表明,该加密算法能抵抗JPEG有损压缩、图像剪切、重度噪音污染和重采样等攻击,因此该法具有较强的鲁棒性；由于很难破解多重密钥,所以该算法具有极高的安全性.

Image Encryption Technique Using Multiple Fresnel Diffraction Transforms and Phase Encryption Masks

The new image encryption algorithm was proposed based on multiple Fresnel diffraction transforms and phase encryption masks.The encrypted image was transformed into the random cipher-text matrix after multiple Fresnel diffraction transforms with phase encryption masks.The diffraction distances and phase encryption masks were the encryption keys mainly.The decrypted image was correct only when the all keys were correct.Numerical experiments show that the algorithm is robust to the attacks of the JPEG lossy compressing,cropping,strong superposing noise,resampling from the screen copy.Since the many keys cannot be decrypted,the algorithm has high security.