@techreport{oai:ipsj.ixsq.nii.ac.jp:00094672,
 author = {吉田, 耕太 and 西村, 浩二 and 大東, 俊博 and 相原, 玲二 and Kouta, Yoshida and Kouji, Nishimura and Toshihiro, Ohigashi and Reiji, Aibara},
 issue = {15},
 month = {Jul},
 note = {近年のモバイル端末の普及から，ネットワークを介してデータを保管するクラウドストレージサービスには強いニーズがある．これらのサービスではデータをセキュアに保管する必要があり，そのための技術として可用性と秘匿性を向上させることができる秘密分散法が注目を集めている．しかし，データ容量が増えてしまう秘密分散は通信帯域の乏しいモバイル端末での処理に適していない．一方，秘密分散処理を外部サーバに委託する場合，情報漏洩の危険性があることから AES などの暗号化を組み合わせる必要があり，それに伴い鍵管理コストが発生してしまう．そこで本稿では，暗号化と秘密分散法を組み合わせた方式を発展させ，鍵管理の不要な安全な処理委託方式を提案し，その実用性を考察する．, There is a big demand in the cloud storage service to store data via network from the rapid spread of mobile devices in recent years. Because there is a need to store data in safety in these services, Secret Sharing Scheme (SSS) which can improve the availability and confidentiality as a technology suitable for it has attracted attention. However, processing of secret sharing scheme which data capacity would increase is not suitable for processing by mobile devices of poor communication bandwidth. On the other hand, when outsourcing of SSS to outside server, it is necessary to combine encryption such as AES because of the risk of information leakage, and key management costs occur due to it. In this paper, we propose a secure outsourcing scheme which is unnecessary of key management by developing a method that combines encryption and SSS, and we consider its practicality.},
 title = {秘密分散法を利用したクラウドストレージサービスのための安全な処理委託方式},
 year = {2013}
}