本文在DES加密的基础上，研究数字图像的置乱问题。

Based on DES in cryptography, image scrambling is studied in this paper.

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图像置乱是实现图像加密的重要手段之一。

Image scrambling is an available means for image encryption.

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图像置乱是实现图像加密的重要手段之一。

Image scrambling is an available means for image encryption.

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