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提出一种基于变换的图象加密算法，该算法通过随机化图象信号的相位谱来实现加密，实验结果表明该加密算法具有很好的保密性．
A transform-based image encryption algorithm is proposed, which encrypts the signal by randomizing the phase spectrum of the image signal. Experimental results show that the encryption algorithm has good confidentiality.