一种图像块旋转的马赛克拼图伪装隐写

为了提高无载体隐写效率以及隐写鲁棒性，提出了一种图像块旋转的马赛克拼图伪装隐写方法。首先在发送端将共享图像库中利用密钥随机选择的图像缩小并调整色调，再依据秘密信息和密钥对每个图像块添加随机旋转角度形成编码图像，最后将编码图像按规则排列产生含密马赛克图像；接收端依据密钥去除随机旋转，读取编码图像旋转角度获得秘密信息。实验结果表明，所提方法在嵌入容量方面优于其他无载体隐写方法，在鲁棒性方面也有良好的性能。

A Mosaic Puzzle Camouflage Steganography with Image Block Rotation

In order to improve the efficiency and robustness of coverless steganography, a mosaic puzzle camouflage steganography with image block rotation is proposed. Firstly, the sender reduces the image randomly selected using the key in the shared image library and adjusts its tone. Then a random rotation angle is added to each image block according to the secret information and secret key to encode the image. Finally, the encoded image is arranged based on the rules to generate the secret mosaic image. The receiver removes the random rotation according to the secret key and obtains the secret information by reading the rotation angle of the encoded image. Experimental results show that the proposed method outperforms other coverless steganography methods in terms of embedding capacity and robustness.