講演・口頭発表等

国際会議
2018年10月28日

Attack on Multiple-Use Password Protected Secret Sharing

2018 The International Symposium on Information Theory and Its Applications
  • Taiyu Kamiyama
  • ,
  • Yuta Ugaya
  • ,
  • Keisuke Kodaira
  • ,
  • Tomoharu Shibuya

記述言語
英語
会議種別
ポスター発表
主催者
Engineering Sciences Society, IEICE
開催地
シンガポール

conventional secret sharing, password protected secret sharing (PPSS) was invented. Recently, Nakahara et al. improved Ogata's multiple-use PPSS (mPPSS), which protects multiple data by one password, by employing secure computation known as CSEC70 method in the user authentication. In this paper, we propose an attack on Nakahara's mPPSS that presumes on a security hall in the adoption of CSEC70 method. Then, we show that the proposed attack enables an administrator of any server of the system to disclose the password of an arbitrary user in Nakahara's mPPSS.

リンク情報
URL
http://www.isita.ieice.org/2018/home.html