{"links":{},"id":2009662,"metadata":{"_oai":{"id":"oai:ipsj.ixsq.nii.ac.jp:02009662","sets":["1164:4088:1771221559804:1777431367596"]},"path":["1777431367596"],"owner":"80578","recid":"2009662","title":["理論最適かつ実効率にも優れた2者間分散型ORAM"],"pubdate":{"attribute_name":"PubDate","attribute_value":"2026-05-21"},"_buckets":{"deposit":"46418622-26cd-4c86-9546-3366f587dd49"},"_deposit":{"id":"2009662","pid":{"type":"depid","value":"2009662","revision_id":0},"owners":[80578],"status":"published","created_by":80578},"item_title":"理論最適かつ実効率にも優れた2者間分散型ORAM","author_link":[],"item_titles":{"attribute_name":"タイトル","attribute_value_mlt":[{"subitem_title":"理論最適かつ実効率にも優れた2者間分散型ORAM","subitem_title_language":"ja"},{"subitem_title":"Optimal and Concretely Efficient 2-party Distributed ORAM","subitem_title_language":"en"}]},"item_keyword":{"attribute_name":"キーワード","attribute_value_mlt":[{"subitem_subject":"CSEC","subitem_subject_scheme":"Other"}]},"item_type_id":"4","publish_date":"2026-05-21","item_4_text_3":{"attribute_name":"著者所属","attribute_value_mlt":[{"subitem_text_value":"NTT社会情報研究所"}]},"item_4_text_4":{"attribute_name":"著者所属(英)","attribute_value_mlt":[{"subitem_text_value":"NTT Social Informatics Laboratories","subitem_text_language":"en"}]},"item_language":{"attribute_name":"言語","attribute_value_mlt":[{"subitem_language":"jpn"}]},"item_publisher":{"attribute_name":"出版者","attribute_value_mlt":[{"subitem_publisher":"情報処理学会","subitem_publisher_language":"ja"}]},"publish_status":"0","weko_shared_id":-1,"item_file_price":{"attribute_name":"Billing file","attribute_type":"file","attribute_value_mlt":[{"url":{"url":"https://ipsj.ixsq.nii.ac.jp/record/2009662/files/IPSJ-IOT26073017.pdf","label":"IPSJ-IOT26073017.pdf"},"date":[{"dateType":"Available","dateValue":"2028-05-21"}],"format":"application/pdf","billing":["billing_file"],"filename":"IPSJ-IOT26073017.pdf","filesize":[{"value":"971.8 KB"}],"mimetype":"application/pdf","priceinfo":[{"tax":["include_tax"],"price":"660","billingrole":"5"},{"tax":["include_tax"],"price":"330","billingrole":"6"},{"tax":["include_tax"],"price":"0","billingrole":"43"},{"tax":["include_tax"],"price":"0","billingrole":"44"}],"accessrole":"open_date","version_id":"67ce8e98-cd33-49e9-af39-5ca5865b88db","displaytype":"detail","licensetype":"license_note","license_note":"Copyright (c) 2026 by the Information Processing Society of Japan"}]},"item_4_creator_5":{"attribute_name":"著者名","attribute_type":"creator","attribute_value_mlt":[{"creatorNames":[{"creatorName":"市川,敦謙"}]}]},"item_4_source_id_9":{"attribute_name":"書誌レコードID","attribute_value_mlt":[{"subitem_source_identifier":"AA12326962","subitem_source_identifier_type":"NCID"}]},"item_4_textarea_12":{"attribute_name":"Notice","attribute_value_mlt":[{"subitem_textarea_value":"SIG Technical Reports are nonrefereed and hence may later appear in any journals, conferences, symposia, etc."}]},"item_resource_type":{"attribute_name":"資源タイプ","attribute_value_mlt":[{"resourceuri":"http://purl.org/coar/resource_type/c_18gh","resourcetype":"technical report"}]},"item_4_source_id_11":{"attribute_name":"ISSN","attribute_value_mlt":[{"subitem_source_identifier":"2188-8787","subitem_source_identifier_type":"ISSN"}]},"item_4_description_7":{"attribute_name":"論文抄録","attribute_value_mlt":[{"subitem_description":"Oblivious RAM (ORAM)はアクセスパターンを秘匿したまま秘匿化されたデータの検索・操作が可能な技術であり，特に分散型ORAMと呼ばれるモデルは多者間でデータを分散した状態でのデータアクセスを実現することからマルチパーティ計算への応用が期待される．特に2者間での秘密計算において親和性の高い手法として2者間分散型ORAMがこれまで複数提案されている．そのうち，ORAMの理論上最適な計算量であるO(logN)を達成する手法も提案されているが，既存の手法ではO記法に隠された定数が非常に大きく，実効率における欠点がある．一方で，実効率とサーバ間通信量O(logN)を両立する手法も知られているが，こちらはサーバのローカル計算量がO(N)であり，データ総数Nに対し計算量のスケーリングが大きい欠点がある．本研究ではこれらの課題を解決し，理論最適であるO(logN)の計算量を達成しつつ，同時に隠れた定数も削減し実効率を改善した手法を提案する．","subitem_description_type":"Other"}]},"item_4_biblio_info_10":{"attribute_name":"書誌情報","attribute_value_mlt":[{"bibliographicPageEnd":"6","bibliographic_titles":[{"bibliographic_title":"研究報告インターネットと運用技術（IOT）"}],"bibliographicPageStart":"1","bibliographicIssueDates":{"bibliographicIssueDate":"2026-05-21","bibliographicIssueDateType":"Issued"},"bibliographicIssueNumber":"17","bibliographicVolumeNumber":"2026-IOT-73"}]},"relation_version_is_last":true,"weko_creator_id":"80578"},"created":"2026-05-14T07:17:16.627365+00:00","updated":"2026-05-14T07:17:22.033760+00:00"}