コマノ　ユウイチ   駒野　雄一    所属   千葉工業大学  情報変革科学部 高度応用情報科学科    千葉工業大学  情報科学研究科 情報科学専攻    職種   教授
言語種別	英語
発行・発表の年月	2014
形態種別	国際会議プロシーディングス
査読	査読あり
標題	A New Model of Client-Server Communications under Information Theoretic Security
執筆形態	共著
掲載誌名	2014 IEEE INFORMATION THEORY WORKSHOP (ITW)
掲載区分	国外
出版社・発行元	IEEE
巻・号・頁	pp.511-515
著者・共著者	Mitsugu Iwamoto,Tsukasa Omino,Yuichi Komano,Kazuo Ohta
概要	A new model for a Client-Server Communication (CSC) system satisfying information theoretic security is proposed, and its fundamental properties are discussed. Our CSC allows n users to upload their respective messages to a server securely by using symmetric key encryptions with their own keys, and all ciphertexts are decrypted by the server. If we require all messages to be perfectly secure in CSC against the corrupted clients and adversaries without any keys, it is proved that a one time pad or more inefficient encryption must be used for each communication link between a client and the server. This means that, in order to realize more efficient CSC, it is necessary to leak out some information of each message. Based on these observations, we introduce a new model for such a secure CSC formally, and discuss its fundamental properties. In addition, we propose the optimal construction of CSC under several constraints on security parameters called security rates.
DOI	10.1109/ITW.2014.6970884
ISSN	2475-420X
PermalinkURL	http://dblp.uni-trier.de/db/conf/itw/itw2014.html#conf/itw/IwamotoOKO14