为了提供较大的可调信息嵌入量和保持载密图像良好的视觉质量,提出一种基于模运算及其周期性特点的安全隐写算法。首先将秘密信息流转为n进制信息流表示,然后根据余数循环的特点,应用具有安全特性的模函数将一位n进制信息嵌入载体图像的一个像素中,直至信息嵌入完毕。选择不同的参数n可以得到不同的嵌入率和载密图像视觉质量。理论分析和实验结果表明,本文算法在保持高嵌入率的同时仍保持较好的载密图像视觉质量,且安全性好;其信息嵌入率选择具有高度弹性,可以根据实际要求选择在嵌入率和载密图像质量都很理想的隐写方案。与同类算法相比具有更强的实用性。

In order to provide a large,scalable embedding capacity and maintain a good visual quality of the stego-image,In this paper, a secure steganography based on modulo and its cyclical characteristic is presented. First,the secret data stream is converted into an n-ary notational system data stream. Then,according to the characteristic of the remainder cycle,one n-ary notational information will be embedded into one pixel of the cover image by a modulus function with security features,until the secret data is embedded completely. Different parameter n gets different rates of embedding and visual quality of the stego-image. Theoretical analysis and experimental results show that the algorithm can maintain a high embedding rate while maintaining good visual quality of stego-image,and good security. The information-embedding rate is highly flexible,and the method can choose the steganographic scheme according to the actual requirements,for which the embedding rate and stego-image quality are ideal. It is more practical than other similar algorithns.