@article{oai:doshisha.repo.nii.ac.jp:00028598,
 author = {東出, 朋之 and Higashide, Tomoyuki and 衣斐, 信介 and Ibi, Shinsuke and 高橋, 拓海 and Takahashi, Takumi and 岩井, 誠人 and Iwai, Hisato},
 issue = {3},
 journal = {同志社大学ハリス理化学研究報告, The Harris science review of Doshisha University},
 month = {Oct},
 note = {無線通信では空間を介して情報の送受信を行うため，有線通信に比べ第三者による電波傍受が容易である．そのため，盗聴や不正アクセスの脅威に晒されており，セキュリティ面での脆弱性の問題がある．盗聴対策の一つとして電波伝搬特性を用いた物理層での秘密鍵共有方式が注目されている．多くの秘密鍵共有方式では鍵生成における量子化の過程においてスカラー量子化を用いているが，ベクトル量子化に比べ正規局間の鍵不一致率が高くなる．一般的には正規局間の鍵不一致率が最小となるベクトル量子化器を選択するが，盗聴局にとっても鍵生成が容易なものとなる．本検討では，空間相関のあるMIMO通信路を想定し，正規局間の空間相関を鍵情報に用いるとともに，ベクトル量子化器選択基準に盗聴局に漏れる情報量を考慮することで，盗聴局に漏れ出す情報を最小化しつつ正規局間での鍵不一致率を維持する方式を提案し，その特性をシミュレーションにより評価する．, Wireless communication is riskier than wired communication due to eavesdrop by unauthorized stations. To deal with this problem, public key cryptosystem and common key cryptosystem are used in general. In contrast, key agreement schemes based on information-theoretically security attract attention. One example is a secret key agreement scheme based on radio wave propagation characteristics. This technique uses channel reciprocity and location dependency of radio wave propagation. Most of the secret key agreement schemes generate keys by scalar quantization. However, secret keys generated by scalar quantization occur key disagreement in higher probability than these by vector quantization. A general quantizer selection scheme selects a quantizer with minimum key disagreement between two authorized stations. An eavesdropper is able to generate keys with this quantizer more easily. This paper assumes correlated MIMO channel, and proposed the quantizer utilizing correlation between authorized stations as key information and the quantizer selection scheme taking key entropies leak to eavesdroppers into consideration. This scheme that reduces information leaks to eavesdropper maintaining key disagreement probability between authorized stations., application/pdf},
 pages = {157--166},
 title = {相互情報量最大化規範ベクトル量子化を用いた物理層秘密鍵共有方式に関する検討},
 volume = {62},
 year = {2021},
 yomi = {ヒガシデ, トモユキ and イビ, シンスケ and タカハシ, タクミ and イワイ, ヒサト}
}