CAJ | 학술논문

为了避免使用复数来密文记录和传输彩色图像，提出一种基于附加密钥复用的彩色图像加密方法。先把彩色图像分成三基色分量：红、绿、兰；选取3个独立的附加密钥分别对这3个分量使用改进的光学联合相关变换法加密，得到3个联合功率谱。把这3个联合功率谱进行叠加，得到的复合联合功率谱即加密结果，其包含了原始彩色图像的全部信息。解密时，使用加密时所用的3个附加密钥分别对此复合联合功率谱进行解密，即可正确地重建原始图像的红、绿、蓝分量，进而恢复出原始图像。计算机仿真结果表明，本方法可以将一幅原始彩色图像隐藏于单幅强度图像之中。由于记录强度图像无需参考光波，因此本方法在加密过程中成功地避免了干涉装置，降低了对加密环境的要求。此外，相比于其他彩色图像隐藏方法需要加密至复数密文之中，本方法的密文大小仅为其二分之一，加密效率提高了一倍。
위료피면사용복수래밀문기록화전수채색도상，제출일충기우부가밀약복용적채색도상가밀방법。선파채색도상분성삼기색분량：홍、록、란；선취3개독립적부가밀약분별대저3개분량사용개진적광학연합상관변환법가밀，득도3개연합공솔보。파저3개연합공솔보진행첩가，득도적복합연합공솔보즉가밀결과，기포함료원시채색도상적전부신식。해밀시，사용가밀시소용적3개부가밀약분별대차복합연합공솔보진행해밀，즉가정학지중건원시도상적홍、록、람분량，진이회복출원시도상。계산궤방진결과표명，본방법가이장일폭원시채색도상은장우단폭강도도상지중。유우기록강도도상무수삼고광파，인차본방법재가밀과정중성공지피면료간섭장치，강저료대가밀배경적요구。차외，상비우기타채색도상은장방법수요가밀지복수밀문지중，본방법적밀문대소부위기이분지일，가밀효솔제고료일배。
In order to avoid the record and transmission of color image with complex ciphertext , we proposed to encrypt color images with a modified joint transform correlator by additional key multiplexing .First of all ,a color image was separated into 3 components :red ,green ,and blue .Then the 3 grey images were encrypted with different additional keys to generate corre-sponding joint power spectra ,and the encryption results were got ,namely multiplexed joint power spectra by superposing the above mentioned joint power spectra .Furthermore ,the de-cryption of the multiplexed joint power spectra with the correct additional key could give the corresponding primary grey images .Computer simulations show that the proposal can hide a color image into a single intensity pattern .Since recording intensity image is free from the ref-erence wave ,our method relaxes the environment and avoids interference equipment .In addi-tion ,compared with previous methods that encrypt image into complex ciphertext ,the size of ciphertext of our approach is only half of it ,thus the efficiency of the encryption is further im-proved .