提出了一种新的，基于主机身份的一次性密钥交换协议i- OKEP，并分析了其安全性。

After this, the paper takes out a new host Indentity based One-time Key Exchange Protocol (I-OKEP), and analyzes its security character.

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密钥扩展采用一次性生成方式。

One-time key expansion was adopted.

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密钥扩展采用一次性生成方式。

One-time key expansion was adopted.

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