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Nowadays, the information security of digital image has already become the international hot subject.
当今，数字图像的信息安全已经成为国际上研究的热门课题。
In the existing method of digital watermark, for embedding watermark information, authors modify more or less original image data through various methods to limit its robustness and security.
已有的数字水印方法为了嵌入水印信息都对原图像数据采用各种方法或多或少地进行了修改，这样做使其鲁棒性和安全性受到限制。
As a branch of multimedia information security technology, digital image authentication is paid close attention by one of a growing number of experts.
数字图像认证技术作为多媒体信息安全技术的分支之一，受到了越来越多专家学者的重视。
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