| 一种提高跳频系统密钥量的新方法 |
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| 引用本文： | 沈斐,宋铁成,叶芝慧,刘彤,夏玮玮.一种提高跳频系统密钥量的新方法[J].东南大学学报,2004,20(4):412-417. |
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| 作者姓名： | 沈斐 宋铁成 叶芝慧 刘彤 夏玮玮 |
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| 作者单位： | 东南大学移动通信国家重点实验室，南京210096 |
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| 基金项目： | 国家自然科学基金，国家高技术研究发展计划(863计划)，the High Technology Research and Development Program of Jiangsu Province，the Key Project of Science and Technolohy of Ministry of Education |
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| 摘 要： | 基于信息论原理, 提出了一种非等间隔跳频系统的方案, 针对不允许频谱重叠系统和允许频谱重叠系统, 分别给出了实现方法并对其安全性能进行了理论分析. 首先给出了跳频系统的绝对密钥量和相对密钥量、等间隔和非等间隔跳频系统等定义; 然后分析了等间隔和非等间隔跳频系统的绝对密钥量和相对密钥量, 从而看出在计算机技术和集成电路设计技术得到飞速发展的情况下, 跳频系统的绝对密钥量已变成制约其保密性和安全性的关键; 理论分析和实例计算可以看出, 采用非等间隔跳频后其绝对密钥量有大幅度提高, 特别是允许频谱重叠的系统, 比等间隔跳频系统提高了2个数量级以上.
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| 关 键 词： | 跳频系统 密钥量 信息安全 非等间隔载频 频移滤波器 |
Novel method of enhancing the key amount for FH systems |
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| Shen Fei Song Tiecheng Ye Zhihui Liu Tong Xia Weiwei.Novel method of enhancing the key amount for FH systems[J].Journal of Southeast University(English Edition),2004,20(4):412-417. |
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| Authors: | Shen Fei Song Tiecheng Ye Zhihui Liu Tong Xia Weiwei |
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| Abstract: | Based on the principle of information theory, a novel scheme of unequal-interval frequency-hopping (FH) systems is proposed. For cases of spectrum overlapping systems and non-overlapping systems, the implementation methods are presented and the security performances are discussed theoretically. Firstly, the definitions of absolute and relative key amounts of FH systems, equal-interval and unequal-interval FH systems are given. Then, the absolute key amount and relative key amount are analyzed for equal-interval and unequal-interval FH systems. The results indicate that the absolute key amount has become the key point in improving the security and secrecy of FH systems, especially in today's epoch of highly developed computer science and IC design technology. Theoretical analysis and practical examples show that the absolute key amount of unequal-interval FH systems is generally over two orders larger than that of equal-interval ones when spectrum overlapping is allowable. Therefore, there is great superiority in enhancing the security and secrecy for the scheme mentioned. |
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| Keywords: | frequency-hopping system key amount security of information unequal-interval carriers frequency-shift filter |
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