通过引入特征串的概念，算法较好的将空间域上常见的基于位修改和基于块均值的水印算法结合在一起。

The introduction of the concept of characteristic string, perfectly combines algorithms based on bit-change and algorithms based on block-mean.

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认识缓冲区溢位的重要一点是︰在发生溢位时，会潜在地修改碰巧指派在缓冲区附近的任何资料。

The important thing to realize about buffer overflows is that any data that happen to be allocated near the buffer can potentially be modified when the overflow occurs.

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它负责释放槽位并修改全局列表。

It frees the slot and modifies the global list.

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