It is shown that the combination of chaotic encryption and conventional encryption is important for raising the security of cryptosystems.

分析表明，这是提高加密系统安全性的一个新的重要研究课题。

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Public key Cryptosystems is key technology of realizing information security.

公钥密码体制是实现信息安全保密的关键技术。

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Using the theorem of linear Diophantine equations and the Chinese remainder theorem, we have constructed a class of trap-door knapsack public-key cryptosystems, which have a better security.

利用不定方程理论及中国剩余定理，我们设计了一类陷门背包公开钥密码系统，它们具有更好的安全性。

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