CAJ | 학술논문

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.
수착Internet기술여다매체기술적비속발전,대다매체수거적존저급안전전수야제출료교고적요구.이전통적도상가밀기술지시장기작위보통수거류진행가밀,몰유고필다매체수거적특점화수거압축적중요성,인차유일정적국한성.제출료기우JPEG2000적도상가밀산법,산법핵심시장가밀과정화해밀과정감입도JPEG2000적편마화해마과정중,병차지선취소파분해후적저빈화고빈계수가밀,가밀산법채용혼돈묘영사.인차기보밀성교고,병차대부분수거가밀야대대강저료산법적시간복잡도,제고료산법적계통적집행효솔.
The increased popularity of multimedia applications places a great demand on efficient data storage and transmission techniques. Unfortunately, traditional encryption techniques have some limits for multimedia information, especially image and video, which are considered only to be common data. It is proposed a partial encryption scheme based on JPEG2000 compression. Chaotic cat map is applied to encrypt only those low frequency and high frequency coefficients of image wavelet decomposition before quantization in JPEG2000. Encryption and decryption processing are respectively embedded into encoding and decoding in JPEG2000. And the simulation results indicate that the method greatly reduces time complexity, as well as enhances security.