From analysis of the classic quantum crypt-key allotment agreement called BB84, problems existing in correspondence efficiency are discovered. A new improvement project is put forward.

从分析经典量子密钥分配协议——BB 84协议入手，发现了其在通信效率上存在问题，并由此出发提出了一个新的改进方案。

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To overcome finite word length effects and improve its resistance to the attack of crypt analysis, a chaotic map as a private key is added to the existing chaotic watermarking systems.

该方法在现有的混沌数字水印系统基础上，增加一个混沌映射作为私有密钥来克服有限字长效应和提高算法的抗破译性。

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