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随着 Internet技术与多媒体技术的飞速发展,对多媒体数据的存储及安全传输也提出了较高的要求。而传统的图像加密技术只是将其作为普通数据流进行加密,没有考虑多媒体数据的特点和数据压缩的重要性,因此有一定的局限性。提出了基于JPEG2000的图像加密算法,算法核心是将加密过程和解密过程嵌入到 JPEG2000 的编码和解码过程中,并且只选取小波分解后的低频和高频系数加密,加密算法采用混沌猫映射。因此其保密性较高,并且对部分数据加密也大大降低了算法的时间复杂度,提高了算法的系统的执行效率。
With the rapid development of Internet technology and multimedia technology, the storage and secure transmission of multimedia data also put forward higher requirements. However, the traditional image encryption technology just encrypts it as a normal data stream without considering the characteristics of multimedia data and the importance of data compression, so it has some limitations. An image encryption algorithm based on JPEG2000 is proposed. The core of the algorithm is to embed the encryption process and decryption process into the encoding and decoding process of JPEG2000. Only the low-frequency and high-frequency coefficients of the wavelet decomposition are selected, and the encryption algorithm is chaotic cat mapping. So its confidentiality is higher, and the partial data encryption also greatly reduces the time complexity of the algorithm, and improves the system execution efficiency of the algorithm.