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移動通信路におけるチャネル係数列の一致確認に関する基礎検討

Hideichi Sasaoka, Hisato Iwai

Published Jan 31, 2023• 0 citations
Publisher

Abstract

There are many studies of secret key agreement based on radio propagation characteristics, but there are few studies of the agreement of analog secret information (key). This paper deals with the agreement verification of the channel coefficient sequence (analog secret key) by the information exchange using the public channel. This paper showed a principle to reduce information leakage due to information exchange and devised agreement verification method to use unique event of channel coefficient sequence. This paper also showed examples of unique event such as three points of crossing with a straight line and the wave form of channel coefficient, and product set of the big and small decision of the channel coefficient, and this paper clarified possibility and a problem of the technique using them.

DOI
10.14988/00029400

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Secret key agreement based on radio propagation characteristics attracts attention as a kind of the wireless physical layer security recently. As one field, there is group secret key agreement to notify of the difference between the series of RSS in star and chain connection system. However, the conventional method has a problem in derivation of theoretical expression of the secret key capacity. This paper deals with a close numerical formula of upper and lower limit of the secret key capacity to be given in mutual information for chain connection systems. This paper derives new theoretical expression of the secret key capacity that is a function of the SN ratio by new theoretical analysis for the mutual information. As a result, numerical computation shows that the upper limit of the secret key capacity accords with the lower limit in high SN ratio. In addition, the simulation results show validity of theoretical expression because the simulation results accord with theoretical characteristics well.