一种同态密文域可逆隐藏方案

A reversible image data hiding scheme in Homomorphic encrypted domain

利用Paillier加密的加法同态性质,构造了一个密文域可逆隐写方案。图像拥有者对图像进行预处理,为嵌入消息预留空间,尔后用图像接收者的公钥对图像进行Paillier加密并发送给消息嵌入者;消息嵌入者在接收到密文图像后,利用密钥解密部分信息并将要潜入信息的密文与原图像的密文进行一个同态密文操作;接收者在接收到密文图像后,利用私钥对其进行解密,得到均衡化后的图像,若接收者拥有提取密钥,则可以利用提取算法对消息进行提取并恢复出原始图像。通过MATLAB实验验证了该方案的正确性和良好的嵌入率。

A reversible image data hiding scheme was proposed in homomorphic encryption domain. To reserve space for the embedded message, the original data is handled first of all. Then the image-owner used the receiver＇s public key to encrypt the image and the sender embedded the message into the encrypted image. The receiver decrypted the encrypted image with the private key. The receiver got an image with contrast enhancement. The embedded message would be extracted and the image will be recovered if the receiver had the extracting key. At last, the MATLAB experiment proves the correctness of the scheme and better embedding rate.