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计算机工程

• 安全技术 • 上一篇    下一篇

密钥提取中降低初始不一致率的预处理方法

蔡文炳,张水莲,辛 刚,孙牛牛   

  1. (解放军信息工程大学信息系统工程学院,郑州 450002)
  • 收稿日期:2012-09-12 出版日期:2013-09-15 发布日期:2013-09-13
  • 作者简介:蔡文炳(1988-),男,硕士研究生,主研方向:信息安全;张水莲,教授;辛 刚,讲师、博士研究生;孙牛牛,硕士研究生

Pretreatment Method of Reducing Original Disagreement Rate in Secret Key Extraction

CAI Wen-bing, ZHANG Shui-lian, XIN Gang, SUN Niu-niu   

  1. (Institute of Information System Engineering, PLA Information Engineering University, Zhengzhou 450002, China)
  • Received:2012-09-12 Online:2013-09-15 Published:2013-09-13

摘要: 在密钥生成过程中,传统量化算法会导致量化结果初始不一致率较高,从而降低最终的密钥生成速率。为解决该问题,提出一种基于奇偶校验的预处理方法。合法双方对量化比特进行合理分组,交互每组的奇偶校验位,且双方同时删除校验位不一致的分组。仿真结果表明,该方法能降低初始序列的不一致率,进而提高后端信息协商的效率,特别是当初始不一致率较高时性能改善明显,如当初始不一致率为0.26时,采用该预处理方法的剩余比例较未采用该预处理方法提高近9倍。

关键词: 密钥提取, 初始不一致率, 奇偶校验, 预处理, 密钥长度, 分组长度

Abstract: The traditional quantization algorithms lead high original disagreement rate in the secret key extraction courses, which can reduce the final secret key rate. Aiming at this problem, a pretreatment method based on parity checking is proposed in this paper. The legitimate parities divide the quantization results into groups, and exchange the parity of the groups over a public channel. It removes the groups whose parities are disagreed to reduce the original disagreement rate. Simulation results demonstrate that the new pretreatment method can not only have excellent ability of reducing the original disagreement rate, especially in the case of high original disagreement rate. The remainder ratio of this pretreatment method is improved by nearly nine times when the original disagreement rate is 0.26.

Key words: secret key extraction, original disagreement rate, parity checking, pretreatment, length of secret key, length of group

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