数字音频的新型密码体制及信息隐藏的普适框架

为了从宏观层面增强数字音频信息隐藏的安全性和标准化，建立一个数字音频的新型密码体制和信息隐藏的普适框架，所有在微观层面能抵御现有各种攻击的算法都可以纳入该框架之下，结合形成严密的信息隐藏体制，对数字音频提出一维重排为二维与随机填充方案，以增加密文混乱程度和不确定性；提出基于随机矩阵变换和数论中本原元的两类随机置乱变换，通过多轮复合加密解密变换建立了一个新型的数字音频密码体制，并在此基础提出一个数字水印体制，该密码体制属于计算保密体制，具有语义安全性，该数字水印体制具有鲁棒性、健壮性和安全性，大量的仿真实验验证了结论，结论可推广于建立其他数字多媒体的信息隐藏体制。

Novel cryptosystem and general framework for digital audio information hiding

For standardization and improvement of security of digital audio information hiding at macro level, a novel cryptosystem and a general framework are established. All algorithms at micro level for protection against various existed attacks can be easily brought into this framework so this makes it a more rigorous information hiding framework. For general digital audio data encryption, a method for reordering 1 dimensional data into 2 dimensions and a method for random filling are proposed for increasing the degree of ciphertext disarray and indeterminism. In addition, two classes of random scrambling transforma- tions based on random matrix transformation and the properties of primitive roots in elementary number theory are also proposed. By the multiple iterative compositions of the encryption/decryption, a novel cryptosystem for digital audio data is established and based on it a digital watermark scheme is also proposed. It is proved that the cryptosystem is a computationally secure system of semantic security. The experiments show that the digital watermark scheme is robust and secure. The framework can be generalized and applied to the information hiding for other digital media.