因为这个密码不能第二次使用，故而从理论上来说，即使黑客安装了密码嗅探器也没关系。

The theory is that it doesn't matter if a hacker is running a password sniffer, since the password won't work a second time.

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本片讲述在二次大战期间，美军训练印第安纳瓦霍族人，利用他们的土语作密码，防止日军偷听解码。片中首先交代了瓜达尔坎纳尔岛的战事。

Telling the story of a group of Navajo Indians whose language was used to create a code that was impossible for the Japanese to decode, it takes us first of all to the battle of Guadalcanal.

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本文通过研究公钥密码学中的二次背包体制，给出了一种基于二次背包加密的数字水印算法。

In this paper, we propose a new digital watermarking algorithm based on quadratic knapsack problem, which belongs to public-key cryptosystem.

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