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中文摘要：
本文根据欧拉定理对背包加密体制进行了改进，为了防止破译，采取了变形序列，将超递增序列转化为非超递增的伪随机序列，使得每次加密的密文都不同，加大了破译密文的难度．从而提高了背包加密体制的安全性．
英文摘要：
Based on Euler Theorem, the knapsack of Merkle-Hellman of cryptosystem is improved in this paper. In order to prevent decipher, the paper adopt a deformation of the sequence, making the superincreasing sequence into a non-super increasing pseudo-random sequence so that the cryptograph different once we encrypted each time. Therefore, the algorithm has increased the difficulty of deciphering the cryptograph , Consequently, the security of is the knapsack of cryptosystem has been strengthened.
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