基于混沌离散序列的图像加密算法研究

针对传统加密算法密钥空间小、加密结构简单等不足,提出了一种能极大扩充加密密钥的双重图像加密算法.在发送端,通过连续混沌系统产生图像位置映射矩阵对图像像素位置进行置乱,再通过将图像像素值信息加入离散混沌系统进行扰乱.加密的图像通过以太网进行传输,并在接收端进行像素值同步解密和位置复原.该方法同时利用混沌系统的初值敏感性和混沌系统的同步性对图像进行双重加密.构造的双重混沌图像加密系统结构复杂不易破解且具有极大的密钥空间.实验表明,基于Liu混沌系统与离散混沌同步系统的双重图像加密能够抵挡图像统计攻击与无穷举攻击,并能够在Windows系统上进行实现.

Research on Image Encryption System Based on Chaotic Discrete Sequence

Aiming at the shortcomings of traditional encryption algorithm, such as small key space and simple encryption structure, a double chaotic image encryption algorithm which can greatly extend the encryption key is proposed. At the transmitting end, the image position mapping matrix is generated by the continuous chaotic system, and the image pixel information is added to the chaotic system. The encrypted image is transmitted over Ethernet and the pixel is synchronized and decrypted at the receiving end. The method utilizes the initial sensitivity of the chaotic system and the synchronization of the chaotic system to double encrypt the image. The structure of the double chaotic image encryption system is complex and difficult to crack and has a great key space. The experiments show that the double chaotic image encryption based on Liu chaotic system and discrete chaotic synchronization system can resist image statistical attack and exhaustive attack, and can be realized on Windows system.