计算机工程与设计
計算機工程與設計
계산궤공정여설계
COMPUTER ENGINEERING AND DESIGN
2015年
8期
2058-2063
,共6页
彩色图像无损加密%迭代复数模型%复数矩阵%RGB分量%混沌掩码%串扰效应
綵色圖像無損加密%迭代複數模型%複數矩陣%RGB分量%混沌掩碼%串擾效應
채색도상무손가밀%질대복수모형%복수구진%RGB분량%혼돈엄마%천우효응
color image lossless encryption%iteration plural model%plural matrix%RGB components%chaotic mask%crosstalk effects
当前彩图加密算法都是对其R、G、B分量进行独立加密，属于多通道加密机制，增大了传输延迟；而现有单通道彩图加密算法主要采取频谱切割与压缩思想，忽略了图像高频成分，易产生较大失真。为此，提出混沌掩码耦合迭代复数模型的单通道彩图 RGB同步无损加密算法。引入DCT (discrete cosine transform)与 ZigZag 扫描，将提取的 RGB分量演变为3个矩阵；设计迭代复数模型，形成复数矩阵；借助Logistic映射扰乱其实部与虚部；通过IDCT (inverse discrete co-sine transform)机制，形成复合图像；结合混沌掩码，构造双重加密函数，获取密文。仿真结果表明，与当前彩图加密机制相比，该算法无失真，解密质量更高且高度安全。
噹前綵圖加密算法都是對其R、G、B分量進行獨立加密，屬于多通道加密機製，增大瞭傳輸延遲；而現有單通道綵圖加密算法主要採取頻譜切割與壓縮思想，忽略瞭圖像高頻成分，易產生較大失真。為此，提齣混沌掩碼耦閤迭代複數模型的單通道綵圖 RGB同步無損加密算法。引入DCT (discrete cosine transform)與 ZigZag 掃描，將提取的 RGB分量縯變為3箇矩陣；設計迭代複數模型，形成複數矩陣；藉助Logistic映射擾亂其實部與虛部；通過IDCT (inverse discrete co-sine transform)機製，形成複閤圖像；結閤混沌掩碼，構造雙重加密函數，穫取密文。倣真結果錶明，與噹前綵圖加密機製相比，該算法無失真，解密質量更高且高度安全。
당전채도가밀산법도시대기R、G、B분량진행독립가밀，속우다통도가밀궤제，증대료전수연지；이현유단통도채도가밀산법주요채취빈보절할여압축사상，홀략료도상고빈성분，역산생교대실진。위차，제출혼돈엄마우합질대복수모형적단통도채도 RGB동보무손가밀산법。인입DCT (discrete cosine transform)여 ZigZag 소묘，장제취적 RGB분량연변위3개구진；설계질대복수모형，형성복수구진；차조Logistic영사우란기실부여허부；통과IDCT (inverse discrete co-sine transform)궤제，형성복합도상；결합혼돈엄마，구조쌍중가밀함수，획취밀문。방진결과표명，여당전채도가밀궤제상비，해산법무실진，해밀질량경고차고도안전。
The current color image encryption algorithms independently encrypt the RGB components,which belong to multi-channel encryption mechanism,resulting in big transmission delay.Existing single channel color image encryption algorithms mainly adopt the spectrum cutting technology,which ignores the high frequency component of image and produces the crosstalk effect.To solve these problems,single channel color image synchronous lossless encryption algorithm for RGB components based on plural model coupled chaotic mask was proposed.The DCT transform and ZigZag scanning were introduced to trans-form RGB components into three matrixes.These matrixes were taken into composite matrix by using the iteration image plural model.The position between real and imaginary parts of plural matrix is permutated using Logistic map.The composite permu-tation image was formed using the IDCT.The double encrypt function was constructed with chaos phase mask to get the gray ci-pher.Simulation results show that this encryption algorithm is highly secure.Compared with current algorithms,this algorithm has lossless distortion and its decryption quality is high.
