本文基于指数原理，构造了一种新的乘积型背包体制。

In this paper, we proposed a new type multiplicative Knapsack public-Key cryptosystem, which is based on the index theorem.

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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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通过进行具体分析，提出与传统背包体制完全不同的构造思路，使用非超递增序列构造背包体制。

Though those concrete analysis, it is proposed a new method to construct knapsack scheme, which is use non-super-increasing sequence in this paper.

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