一种有效的加密隐藏算法

以原始图像作为保护信息，利用迭代算法，求得作为加密结果函数和密钥函数的纯相位形式（相息图），然后将加密结果函数隐藏在一个普通图像（或者其它形式）中，完成图像的加密隐藏过程。纯相位形式的隐藏方法，不但将加密和隐藏两种技术结合起来，而且具有特别优良的特性：基于信息隐藏的特点，算法有效降低了外来的恶意攻击可能性；基于加密结果的噪声特性，提高了视觉容许的可隐藏信息量，同时能有效地抗击裁剪、噪声等的影响，具有很强的“鲁棒”性。计算机仿真结果验证了这一点。

An Efficient Information Hiding Method with the Forward Iteratival Algorithm

Using the forward iteratival algorithm, the protected original image was encrypted to phase-only functions including the result image and the key function. Then the result image was hidden within other picture such as common face by the decided method. By means of the phase-only function, it not only related the encryption to hiding, but also was possessed of good properties in this information hiding method. Based on hiding, the protected information was not easy to be attacked. Furthermore, the expected larger hiding information amount was increased, algorithm was also robust to all kinds of noise based on the noise character of encryption image. The simulation result demonstrates this point.