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以往的基于子采样的信息隐藏算法无法抵抗置乱攻击，本文提出了一个改进算法，实验表明该算法能有效抵抗置乱攻击。
The traditional subsampling based information hiding algorithm can not resist the permutation attack. In this paper, an improved algorithm is proposed to resist the permutation attack.
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