为提高数字图像隐写中的隐藏信息容量,提出了一种基于双伪随机数的图像隐写算法.首先介绍了伪随机数生成和双像素嵌入信息原理,然后将随机产生的整数伪随机数看作一个辅助像素值,结合载体图像中的一个像素值将两位秘密信息同时嵌入到一个载体图像像素中,从而在像素改变较小的情况下提高隐藏容量.最后分析了算法的嵌入性能,并通过仿真实验证明,该方法在提高隐藏信息容量的同时,也具有很好的安全性能.

In order to enhance the capacity of steganography,in this paper,an image steganographic algorithm based on Pseudo Random Number(PRN) is proposed.The same Pseudo Random Number sequence is generated by Pseudo Random Number Generator(PRNG) in the parameter certain situation.To utilize this nature of PRNG,the Integer Pseudo Random Number(IPRN) is generated and regarded as an auxiliary pixels value.First,two secret information are hided to one IPRN and one pixel value,and then the secret information which is in the IPRN is displaced to the pixel value.In this way,the two secret information bits are embedded into the pixel value.This method's characteristic is that the capacity of steganography will be enhanced in one time.The experiment proved that this method has a very good security performance and the hiding capacity.