n维超立方体模映射安全隐写算法

针对目前基于模函数的隐写研究现状,提出n维超立方体模映射隐写算法.根据模运算性质定义一个n维模函数,将n个像素值映射到一位aⁿ进制数值,从而可以实现将一位aⁿ进制信息隐藏到n个像素中.选择不同的参数a可以得到不同的嵌入率和载密图像视觉质量,选择较大的参数n且a为偶数时可以得到更好的载密图像视觉质量.理论分析和实验结果表明,本文算法与众多隐写算法相比,不仅具备这些算法的功能,而且具有更好的载密图像视觉质量、安全性和更强的实用性.

Secure Steganography by n-Dimensional Hypercube Modulo Mapping

In order to solve the problems existing in steganography based on modular function, this paper presents n-dimensional hypercube modulo mapping steganographic algorithm.According to modular arithmetic properties, the algorithm defines an n-dimensional modular function which n pixels values are mapped to a data in aⁿ-ary notational system, thus the algorithm realizes that each secret digit in aⁿ-ary notational system is carried by n cover pixels.The algorithm can get different rates of embedding and visual quality of stego image when we choose different parameter a, and can get better visual quality of stego image when a is even number and we choose bigger parameter n.Theoretical analysis and experimental results show that the proposed algorithm, by comparing with many steganography, not only has the function of these algorithms, but also has a better visual quality of stego image, better security, and stronger practicability.