摘要
在量化过程中,现有带保护间隔的量化算法CQG删除特征值较多,导致密钥生成速率较低。为此,提出了一种新的基于CQG算法的改进算法。算法的主要思想为:通信双方互相发送索引信息,根据接收到的索引信息删除边界处会量化出错的特征值。改进算法与CQG算法的不同之处在于通信双方特征值位于同一保护间隔内或一方特征值位于保护间隔内而另一方特征值位于保护间隔外时,双方的特征值不会被删除。仿真结果表明:改进算法使密钥生成速率显著提高,虽然量化后的密钥不一致率相对于CQG算法有所增加,但从整个密钥生成过程考虑,改进算法与信息协商协议结合后,总的密钥生成速率显著提高。
The existing channel quantization algorithm with guard-band（CQG）deletes a large number of eigenvalues during the quantization process,which leads to a lower key generation rate.In this paper,aiming to resolve this problem,it proposes a new improved algorithm based on CQG.The main idea of the algorithm is that the two communication parties transmit the index information to each other,then they remove these eigenvalues which would be mistakenly quantified at the boundary according to the received index information.The difference between proposed algorithm and the CQG is that the eigenvalues of both sides will not be deleted when they are located within the same guardband or when one side is within the guard-band while the other is outside the guard-band.The simulation results show that proposed algorithm can increase the key generation rate significantly.Although the bit mismatch rate increases with respect to the CQG algorithm after quantization,the overall key generation rate is significantly improved when proposed algorithm is combined with the information negotiation phase considering from the entire key generation process.
作者
张洪霞
王秋华
ZHANG Hongxia;WANG Qiuhua(School of Communication Engineering,Hangzhou Dianzi University,HangzhouZhejiang 310018,China)
出处
《杭州电子科技大学学报（自然科学版）》
2018年第4期25-29,共5页
Journal of Hangzhou Dianzi University：Natural Sciences
基金
国家自然科学基金资助项目(61401128)
关键词
物理层安全
密钥提取
多比特量化
信息协商
密钥生成速率
physical layer security
key extraction
multi-bit quantization
information reconciliation
key generation rate
