基于RS码的有扰信道信息隐藏技术的研究

Study of Information Hiding Based on RS Code in Noise Channel Technology

现阶段信息隐藏算法大都采用信源数据作为载体,本文提出了一种基于RS码的有扰信道信息隐藏算法,该算法是将隐秘数据作为信道中的噪声嵌入到对信源的RS编码中。只要在一个码字中嵌入的数据量与噪声的和小于该码的纠错能力,那么该隐藏过程对隐秘对象译码后的数据没有任何影响。实验表明,在信道误码率一定时,当隐藏信息的嵌入率小于某一数值时,该算法具有较好的隐蔽性和鲁棒性。

This paper proposes a kind of algorithm on information hiding based on RS code in noise channel.The algorithm regards stegomessage as channel noise and embeds it in RS code.The paper discusses the optimal embedded position and the maximal embedded stegomessage ratio for one code word.First we detect the channel bit error rate and which type the channel noise belongs to.If the channel noise is stochastic error,we should use channel code with powerful ability to correct stochastic error and embedded the stegomessage in carrier data dispersedly.Otherwise we choose code with powerful ability to correct burst errors and embedded the stegomessage continuously.We can calculate the maximal embedded stegomessage ratio when the channel bit error rate is given.This hiding process has no effect on the decoding data of the secret object only if the total number of embedded data and channel noise in one code word is within the bound of error correcting capability.The experiment shows that this algorithm has better robustness and imperceptibility when the embedded stegomessage ratio is smaller than some number.